Description of Campaign
The
ServHelper backdoor, which has ties to the TA505 threat group, was discovered dropping a hidden cryptominer. The digital miner, known as
LoudMiner, is installed in a virtual environment to evade antivirus detection. But, it is only installed if the endpoint has more than 5 GB of available physical memory. The malware uses several techniques for execution, defense evasion, and persistence. These techniques include PowerShell, obfuscation, DLL hijacking, and
cmd.exe.
How to use this article:
- If a Threat Hunting table has been created, use the rules contained to search for malware related to this campaign.
- Review the product detection table and confirm that your environment is at least on the specified content version.
To download the latest content versions, go to the Security Updates page.
- Scroll down and review the "Product Countermeasures" section of this article. Consider implementing them if they are not already in place.
- Review KB91836 - Countermeasures for entry vector threats.
- Review KB87843 - Dynamic Application Containment rules and best practices.
- Review KB82925 - Identify what rule corresponds to an Adaptive Threat Protection and Threat Intelligence Exchange event.
Campaign IOC
| Type |
Value |
| SHA256 |
A7ECF925427FA07C40FF335E57EE04DCB028A97B4C5A8429CC7ED101CB30B1D0 |
| SHA256 |
26E2794167F5A4F5A1C7E708823B77FD6500290DF4DA225181D55F030B0043EB |
| SHA256 |
C0F5375DD4530C7554212E7C8D85EBE41370BE49E1AA40D381F2E34CBF319134 |
| URL |
http://asggh554tgahhr.pw |
| URL |
http://rotoscoping.xyz:3389 |
| URL |
http://losos.cn:7201 |
| URL |
http://sggh554tgahhr.pw |
| URL |
http://gabardina.xyz/log.txt |
| URL |
http://safuuf7774.pw/iplog/vmt.php?hst=vmt_installed_ |
| URL |
http://esggh554tgahhr.pw |
| URL |
http://romashka.cn/guga.txt |
| URL |
http://kuarela.xyz/1.txt |
| URL |
http://asggh554tgahhr.pw/list/b.php |
| URL |
http://hsggh554tgahhr.pw |
| URL |
http://almagel.icu/cp.exe |
| URL |
http://dfsgu747hugr.pw |
| URL |
http://nsggh554tgahhr.pw |
| URL |
http://almagel.icu/ssh.zip |
Minimum Content Versions:
| Content Type |
Version |
| V2 DAT (VirusScan Enterprise) |
9685 |
| V3 DAT (Endpoint Security) |
4137 |
Detection Summary
| IOC |
Scanner |
Detection |
| A7ECF925427FA07C40FF335E57EE04DCB028A97B4C5A8429CC7ED101CB30B1D0 |
AVEngine V2 |
PS/Agent.cc |
| AVEngine V3 |
PS/Agent.cc |
| JTI (ATP Rules) |
- |
| RP Static |
- |
| RP Dynamic |
- |
| IOC |
Scanner |
Detection |
| 26E2794167F5A4F5A1C7E708823B77FD6500290DF4DA225181D55F030B0043EB |
AVEngine V2 |
Generic backdoor.xl |
| AVEngine V3 |
Generic backdoor.xl |
| JTI (ATP Rules) |
JTI/Suspect.196612!8b2ed8fee08f |
| RP Static |
- |
| RP Dynamic |
- |
| IOC |
Scanner |
Detection |
| C0F5375DD4530C7554212E7C8D85EBE41370BE49E1AA40D381F2E34CBF319134 |
AVEngine V2 |
NSIS/Dropper.c |
| AVEngine V3 |
NSIS/Dropper.c |
| JTI (ATP Rules) |
ATP/Suspect!b5d709d2b91f |
| RP Static |
- |
| RP Dynamic |
- |
Minimum set of Manual Rules to improve protection to block this campaign
IMPORTANT: Always follow best practices when you enable new rules and signatures.
When you implement new rules or signatures, always set them to Report mode first and check the alerts generated. Resolve any issues that arise and then set the rules to Block. This step mitigates against triggering false positives and allows you to refine your configuration.
For more information, see KB87843 - List of and best practices for Endpoint Security Dynamic Application Containment rules.
Endpoint Security - Advanced Threat Protection:
Rule ID: 4 Use GTI file reputation to identify trusted or malicious files
Endpoint Security - Exploit Prevention:
Rule ID: 6073 Execution Policy Bypass in Powershell
Rule ID: 6085 Powershell Command Restriction - File
Rule ID: 6151 Unmanaged Powershell Detected – II
Host Intrusion Prevention:
Rule ID: 6082 Powershell Command Restriction - ExecutionPolicy Unrestricted
Rule ID: 6081 Powershell Command Restriction - NoProfile
Rule ID: 6073 Execution Policy Bypass in Powershell
Rule ID: 6085 Powershell Command Restriction - File
Aggressive set of Manual Rules to improve protection to block this campaign
IMPORTANT: Always follow best practices when you enable new rules and signatures.
When you implement new rules or signatures, always set them to Report mode first and check the alerts generated. Resolve any issues that arise and then set the rules to Block. This step mitigates against triggering false positives and allows you to refine your configuration.
For more information, see KB87843 - List of and best practices for Endpoint Security Dynamic Application Containment rules.
Endpoint Security - Dynamic Application Containment:
Modifying the Services registry location
Host Intrusion Prevention:
Rule ID: 6010 Generic Application Hooking Protection
Rule ID: 1148 CMD Tool Access by a Network Aware Application
Rule ID: 1020 Windows Agent Shielding - File Access
Rule ID: 6011 Generic Application Invocation Protection
Rule ID: 2806 Attempt to create a hardlink to a file
