This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It automatically executes files when a user opens a drive.
Arrival Details
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Propagation
The said .INF file contains the following strings:
[version]
Signature=$chicago$
AdvancedINF=2.5
[DefaultInstall]
CustomDestination=CustInstDestSectionAllUsers
RunPreSetupCommands=RunPreSetupCommandsSection
[RunPreSetupCommandsSection]
; Commands Here will be run Before Setup Begins to install
cmd /c start "C:\Windows\temp\{Random Characters}.exe"
taskkill /IM cmstp.exe /F
[CustInstDestSectionAllUsers]
49000,49001=AllUSer_LDIDSection, 7
[AllUSer_LDIDSection]
"HKLM", "SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\CMMGR32.EXE", "ProfileInstallPath", "%UnexpectedError%", ""
[Strings]
ServiceName="Crimson"
ShortSvcName="Crimson"
Other Details
This Trojan automatically executes the following files when a user opens a drive:
- C:\Windows\temp\{Random Characters}.exe
- taskkill /IM cmstp.exe /F
Step 1
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.
Step 2
Search and delete AUTORUN.INF files created by Trojan.INF.HIDDENTEAR.THAOGBA that contain these strings
[ Learn More ]
[DefaultInstall] [RunPreSetupCommandsSection] [CustInstDestSectionAllUsers] [AllUSer_LDIDSection] [Strings]
Signature=$chicago$
AdvancedINF=2.5
CustomDestination=CustInstDestSectionAllUsers
RunPreSetupCommands=RunPreSetupCommandsSection
; Commands Here will be run Before Setup Begins to install
cmd /c start "C:\Windows\temp\{Random Characters}.exe"
taskkill /IM cmstp.exe /F
49000,49001=AllUSer_LDIDSection, 7
"HKLM", "SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\CMMGR32.EXE", "ProfileInstallPath", "%UnexpectedError%", ""
ServiceName="Crimson"
ShortSvcName="Crimson"
Step 3
Scan your computer with your Trend Micro product to delete files detected as Trojan.INF.HIDDENTEAR.THAOGBA. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check the following Trend Micro Support pages for more information: