Cisco Talospublished May 2, 15:04 UTC (May 2, 2019)ingested Sep 10, 06:19 UTC

Qakbot levels up with new obfuscation techniques

mediumMalwareimportance 30

Indicators of compromiseauto-extracted · verify before use · export allAll →

Full article848 words · extracted from blog.talosintelligence.com · click to collapse

Thursday, May 2, 2019 11:04

Executive summary

Qakbot, also known as Qbot, is a well-documented banking trojan that has been around since 2008. Recent Qakbot campaigns, however, are utilizing an updated persistence mechanism that can make it harder for users to detect and remove the trojan. Qakbot is known to target businesses with the hope of stealing their login credentials and eventually draining their bank accounts. Qakbot has long utilized scheduled tasks to maintain persistence. In this blog post, we will detail an update to these schedule tasks that allows Qakbot to maintain persistence and potentially evade detection.

Infection chain

Victims of this malware are typically infected via a dropper. Once infected, a victim machine will create a scheduled task. This task will execute a JavaScript downloader that makes a request to one of several hijacked domains.

The command line string that create this task is:

C:\Windows\system32\schtasks.exe /create /tn {guid} /tr cmd.exe /C "start /MIN C:\Windows\system32\cscript.exe /E:javascript "C:\Users\USERNAME\ymwoyf.wpl" /sc WEEKLY /D TUE,WED,THU /ST 12:00:00 /F

This downloader is executed using the command:

cmd.exe /C start /MIN C:\Windows\system32\cscript.exe /E:javascript C:\ProgramData\\puigje.wpl"
C:\Windows\system32\cscript.exe /E:javascript C:\ProgramData\puigje.wpl

Cisco Talos first observed a spike in requests to these hijacked domains on April 2, 2019. This coincides with DNS changes made to these domains on March 19, 2019. Additionally, the comment string "CHANGES 15.03.19" is contained within the malicious JavaScript downloader, suggesting this actor updated the code on March 15. This indicates that these changes to the Qbot persistence mechanism seem to coincide with the launch of a new campaign.

An example downloader with dated comment line.
This downloader always requests the URI "/datacollectionservice[.]php3." from these hijacked domains. The domains used by the downloader for this request are XOR encrypted at the beginning of the JavaScript. The response to this request is obfuscated data that will be saved as (randalpha)_1.zzz and (randalpha)_2.zzz. The first 1,000 bytes of data are saved to the first .zzz file, while the remainder goes to the second file. The data in these files is decrypted with the code contained in the JavaScript downloader.

An example of the JavaScript used to decode the obfuscated .zzz files.
Additionally, a scheduled task is created to execute a batch file.

An example of this batch file.
This code serves to reassemble the malicious Qakbot executable from the two .zzz files, using the type command. The two .zzz files are then deleted after the reassembled executable is run. The functionality of the Qakbot malware remains the same.

Conclusion

There has been a change in the infection chain of Qakbot that makes it more difficult for traditional anti-virus software to detect. This may allow the download of the malware to go undetected, as the malware is obfuscated when it is downloaded and saved in two separate files. These files are then decrypted and reassembled using the type command. Detection that is focused on seeing the full transfer of the malicious executable would likely miss this updated version of Qakbot. Because of this update to persistence mechanisms, the transfer of the malicious Qbot binary will be obfuscated to the point that some security products could miss it.

Coverage

Ways our customers can detect and block this threat are listed below.

Advanced Malware Protection (AMP) is ideally suited to prevent the execution of the malware detailed in this post. Below is a screenshot showing how AMP can protect customers from this threat. Try AMP for free here.

Cisco Cloud Web Security (CWS) or Web Security Appliance (WSA) web scanning prevents access to malicious websites and detects malware used in these attacks.

Email Security can block malicious emails sent by threat actors as part of their campaign.

Network Security appliances such as Next-Generation Firewall (NGFW), Next-Generation Intrusion Prevention System (NGIPS), and Meraki MX can detect malicious activity associated with this threat.

AMP Threat Grid helps identify malicious binaries and build protection into all Cisco Security products.

Umbrella, our secure internet gateway (SIG), blocks users from connecting to malicious domains, IPs, and URLs, whether users are on or off the corporate network.

Additional protections with context to your specific environment and threat data are available from the Firepower Management Center.

Open Source Snort Subscriber Rule Set customers can stay up to date by downloading the latest rule pack available for purchase on Snort.org.

IOCs

C2 domains observed

lg[.]prodigyprinting[.]com
hp[.]prodigyprinting[.]com
layering[.]wyattspaintbody[.]net
painting[.]duncan-plumbing[.]com

Qakbot hashes

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Javascript hashes

dd8c25c7483acb627935b3ec6de505aa7fdf95ee4db8108b89d0deb57510217c
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Text extracted automatically; images, tables and formatting may be missing. Original: https://blog.talosintelligence.com/qakbot-levels-up-with-new-obfuscation/

Type	Indicator	Context
domain	hp.prodigyprinting.com	t.org . IOCs C2 domains observed lg[.]prodigyprinting[.]com hp[.]prodigyprinting[.]com layering[.]wyattspaintbody[.]net painting[.]duncan-plum
domain	layering.wyattspaintbody.net	erved lg[.]prodigyprinting[.]com hp[.]prodigyprinting[.]com layering[.]wyattspaintbody[.]net painting[.]duncan-plumbing[.]com Qakbot hashes 00e4f65b
domain	lg.prodigyprinting.com	ilable for purchase on Snort.org . IOCs C2 domains observed lg[.]prodigyprinting[.]com hp[.]prodigyprinting[.]com layering[.]wyattspaintbody[.
domain	painting.duncan-plumbing.com	hp[.]prodigyprinting[.]com layering[.]wyattspaintbody[.]net painting[.]duncan-plumbing[.]com Qakbot hashes 00e4f65b721b334c3aa40e0c0fdc6310796587498
domain	snort.org	downloading the latest rule pack available for purchase on Snort.org . IOCs C2 domains observed lg[.]prodigyprinting[.]com hp[.]
sha256	00e4f65b721b334c3aa40e0c0fdc63107965874981fbfef1fc6a3ebb9d6c8d1c	ntbody[.]net painting[.]duncan-plumbing[.]com Qakbot hashes 00e4f65b721b334c3aa40e0c0fdc63107965874981fbfef1fc6a3ebb9d6c8d1c 042b8c8ae4525b7fd067c6960def5bb01817bf884db9db0db42c2a3cb10
sha256	042b8c8ae4525b7fd067c6960def5bb01817bf884db9db0db42c2a3cb10ff327	65b721b334c3aa40e0c0fdc63107965874981fbfef1fc6a3ebb9d6c8d1c 042b8c8ae4525b7fd067c6960def5bb01817bf884db9db0db42c2a3cb10ff327 0633c16d45f6fdc9fd6ba13c86572bfb571e2307ea051e2c119b5945800
sha256	0633c16d45f6fdc9fd6ba13c86572bfb571e2307ea051e2c119b59458000b51d	c8ae4525b7fd067c6960def5bb01817bf884db9db0db42c2a3cb10ff327 0633c16d45f6fdc9fd6ba13c86572bfb571e2307ea051e2c119b59458000b51d 0dbf3f0a6a6b77eddd6e63849f2cea98edb855847a51ec313e7b764c5a5
sha256	0dbf3f0a6a6b77eddd6e63849f2cea98edb855847a51ec313e7b764c5a5a3a59	16d45f6fdc9fd6ba13c86572bfb571e2307ea051e2c119b59458000b51d 0dbf3f0a6a6b77eddd6e63849f2cea98edb855847a51ec313e7b764c5a5a3a59 104d491cd7c6e3f7930edb780bed08fc88012a0f7f77f01ef987f270c91
sha256	104d491cd7c6e3f7930edb780bed08fc88012a0f7f77f01ef987f270c9169b49	f0a6a6b77eddd6e63849f2cea98edb855847a51ec313e7b764c5a5a3a59 104d491cd7c6e3f7930edb780bed08fc88012a0f7f77f01ef987f270c9169b49 1430582ad86023fe4b75f4721158ab72c28bef13592ad4462ac30f7b078
sha256	11447fbf6b64d137ab09ae7c861719169650a06ccc44abf0bcbbac8f5830343b	80880c3466e3ff95bc3df309242861b0d43600862b0e9f563bda90d00d3 11447fbf6b64d137ab09ae7c861719169650a06ccc44abf0bcbbac8f5830343b e57062a03e0397ba7b5edba76b92f6e00e00a3f5f3126335a152803ba9d
sha256	1333715b86d4009eb40b92675ed494dda786c275ccdcd59644ea3b0408df3d08	c11d40ef808f9a25a5b3d2104aa67e6ba5a696d1bd352ccdf8b3039df9b 1333715b86d4009eb40b92675ed494dda786c275ccdcd59644ea3b0408df3d08 59dbf5984c48109a16de20656a3305269f4afa66e8864276e69d900d6cf
sha256	1430582ad86023fe4b75f4721158ab72c28bef13592ad4462ac30f7b0784cc37	91cd7c6e3f7930edb780bed08fc88012a0f7f77f01ef987f270c9169b49 1430582ad86023fe4b75f4721158ab72c28bef13592ad4462ac30f7b0784cc37 20e53f19fb58b36c93fff100d0e003ff6e88017d6ee6ae8e56d72ba3e18
sha256	16ea880880c3466e3ff95bc3df309242861b0d43600862b0e9f563bda90d00d3	652a096c007a233fb588d7a1b129a1b68829f78d58bb67b33c3582f032d 16ea880880c3466e3ff95bc3df309242861b0d43600862b0e9f563bda90d00d3 11447fbf6b64d137ab09ae7c861719169650a06ccc44abf0bcbbac8f583
sha256	170f58ca16e031ce31d117ba36a525189cfe4a08fece3fe1d65f18d293e2c7fe	16f0cc13e72c2ed64e857090c6a78106b9accc5f8d8fd90652a293890be 170f58ca16e031ce31d117ba36a525189cfe4a08fece3fe1d65f18d293e2c7fe e64d432aac6c9209d84b9e9b9b77bae4148dba91f49e2871c6a14a2d077
sha256	20e53f19fb58b36c93fff100d0e003ff6e88017d6ee6ae8e56d72ba3e1827250	82ad86023fe4b75f4721158ab72c28bef13592ad4462ac30f7b0784cc37 20e53f19fb58b36c93fff100d0e003ff6e88017d6ee6ae8e56d72ba3e1827250 21898a62a58602b67b39ea4c5ce971be4d73c861a1abff22337d2531f7b
sha256	21898a62a58602b67b39ea4c5ce971be4d73c861a1abff22337d2531f7b18d29	f19fb58b36c93fff100d0e003ff6e88017d6ee6ae8e56d72ba3e1827250 21898a62a58602b67b39ea4c5ce971be4d73c861a1abff22337d2531f7b18d29 2f5b2a72e40226c54871113b18d4e62c76d4cd05eb50a84c02774ed13da
sha256	2ce2651e7ea2ece2b45cadbf7ef916a998d14bbf3830631cf1de6c4c28a97d80	c434e21f40bf5f1e7e2694784e2152834c3c5e7188026efd4d698d63d8d 2ce2651e7ea2ece2b45cadbf7ef916a998d14bbf3830631cf1de6c4c28a97d80 ce65b98b78ee749c5db5cb678cb6a8f21f568446a9e7433f6cb3c2d6486
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