Malware Analysis Report

2024-10-10 13:08

Sample ID 240617-k16raatenh
Target primodal_steam_module.exe
SHA256 fff08a4d2f28a06068b3a440cf4c5ee8f30950af3345c80efcb05839be155f26
Tags
dcrat evasion infostealer rat
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

fff08a4d2f28a06068b3a440cf4c5ee8f30950af3345c80efcb05839be155f26

Threat Level: Known bad

The file primodal_steam_module.exe was found to be: Known bad.

Malicious Activity Summary

dcrat evasion infostealer rat

DCRat payload

Dcrat family

DcRat

DCRat payload

Disables Task Manager via registry modification

Checks computer location settings

Loads dropped DLL

Executes dropped EXE

Unsigned PE

Enumerates physical storage devices

Modifies registry class

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Modifies registry key

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-06-17 09:05

Signatures

DCRat payload

rat
Description Indicator Process Target
N/A N/A N/A N/A

Dcrat family

dcrat

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-17 09:05

Reported

2024-06-17 09:07

Platform

win7-20240508-en

Max time kernel

117s

Max time network

121s

Command Line

"C:\Users\Admin\AppData\Local\Temp\primodal_steam_module.exe"

Signatures

DcRat

rat infostealer dcrat

DCRat payload

rat
Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Disables Task Manager via registry modification

evasion

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\discord\discord.exe N/A

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\cmd.exe N/A
N/A N/A C:\Windows\SysWOW64\cmd.exe N/A

Enumerates physical storage devices

Modifies registry key

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\reg.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\discord\discord.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1684 wrote to memory of 2300 N/A C:\Users\Admin\AppData\Local\Temp\primodal_steam_module.exe C:\Windows\SysWOW64\WScript.exe
PID 1684 wrote to memory of 2300 N/A C:\Users\Admin\AppData\Local\Temp\primodal_steam_module.exe C:\Windows\SysWOW64\WScript.exe
PID 1684 wrote to memory of 2300 N/A C:\Users\Admin\AppData\Local\Temp\primodal_steam_module.exe C:\Windows\SysWOW64\WScript.exe
PID 1684 wrote to memory of 2300 N/A C:\Users\Admin\AppData\Local\Temp\primodal_steam_module.exe C:\Windows\SysWOW64\WScript.exe
PID 2300 wrote to memory of 2708 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 2300 wrote to memory of 2708 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 2300 wrote to memory of 2708 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 2300 wrote to memory of 2708 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 2708 wrote to memory of 2640 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\discord\discord.exe
PID 2708 wrote to memory of 2640 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\discord\discord.exe
PID 2708 wrote to memory of 2640 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\discord\discord.exe
PID 2708 wrote to memory of 2640 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\discord\discord.exe
PID 2708 wrote to memory of 2564 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\reg.exe
PID 2708 wrote to memory of 2564 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\reg.exe
PID 2708 wrote to memory of 2564 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\reg.exe
PID 2708 wrote to memory of 2564 N/A C:\Windows\SysWOW64\cmd.exe C:\Windows\SysWOW64\reg.exe

Processes

C:\Users\Admin\AppData\Local\Temp\primodal_steam_module.exe

"C:\Users\Admin\AppData\Local\Temp\primodal_steam_module.exe"

C:\Windows\SysWOW64\WScript.exe

"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\discord\s1YcuafMgFZcfjAcIZkCnl2ldkoG.vbe"

C:\Windows\SysWOW64\cmd.exe

cmd /c ""C:\Users\Admin\AppData\Roaming\discord\6hjim1XI6LHKwsRzcTW0H.bat" "

C:\Users\Admin\AppData\Roaming\discord\discord.exe

"C:\Users\Admin\AppData\Roaming\\discord\discord.exe"

C:\Windows\SysWOW64\reg.exe

reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f

Network

N/A

Files

C:\Users\Admin\AppData\Roaming\discord\s1YcuafMgFZcfjAcIZkCnl2ldkoG.vbe

MD5 882088368dcd0aeacfbd6ecb5c6a4bf5
SHA1 ceff64387f97e543cccf1d1967256c5709771006
SHA256 95a165aaa06147d9e24952f1f497ebcfee7edc8fec0c8dc86cc4da4a63d23b0b
SHA512 8e05bd8f2d14b6c7fd5f923ede83b723ff26f93dc9d21fa6d21e4a3e097f4472abbfe7554911a0ffa48a950ec421f5ac5077a9b9b044c73e5ab5ad442f6ef830

C:\Users\Admin\AppData\Roaming\discord\6hjim1XI6LHKwsRzcTW0H.bat

MD5 1c21369bf1354782eb9c430fc1351179
SHA1 06d6a05de2c90239fd34e5eef61748cf0817f109
SHA256 ef5c3a480c4fbb67d912fa95920a71bc8b556ec7d270aabe9985dfa379369ab5
SHA512 9e75859de45774157a9be88e7914a87d234dff6e4794fb25d4d8bb04f55f17d289213547ec7cf48170a3e3f9a7cb965969136b9885bbac9ce92e867edec75e18

C:\Users\Admin\AppData\Roaming\discord\discord.exe

MD5 f6a2be982232660a4ef7923c9ea2a0f4
SHA1 49fd2c8a022c15d0286551fc81b2395e29079c7e
SHA256 db44adcc5a6919a3e2c56230a0b755ea6eb25cd9cfb4c7aceda76a9c3fad5fc2
SHA512 97e4dddd23a33ffb5678bc361ff00a8418cc3a6ce7ff86c1f76e29ecb4149f3fb1cb112fde77ab067a9fcda3ef46cfa2b9b6c2fbfc0d68371db34adf39b47284

memory/2640-13-0x0000000000870000-0x0000000000B54000-memory.dmp

memory/2640-14-0x0000000000240000-0x000000000024E000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-17 09:05

Reported

2024-06-17 09:07

Platform

win10v2004-20240508-en

Max time kernel

147s

Max time network

151s

Command Line

"C:\Users\Admin\AppData\Local\Temp\primodal_steam_module.exe"

Signatures

DcRat

rat infostealer dcrat

DCRat payload

rat
Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Disables Task Manager via registry modification

evasion

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-3558294865-3673844354-2255444939-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\primodal_steam_module.exe N/A
Key value queried \REGISTRY\USER\S-1-5-21-3558294865-3673844354-2255444939-1000\Control Panel\International\Geo\Nation C:\Windows\SysWOW64\WScript.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\discord\discord.exe N/A

Enumerates physical storage devices

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-3558294865-3673844354-2255444939-1000_Classes\Local Settings C:\Users\Admin\AppData\Local\Temp\primodal_steam_module.exe N/A

Modifies registry key

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\reg.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\discord\discord.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\primodal_steam_module.exe

"C:\Users\Admin\AppData\Local\Temp\primodal_steam_module.exe"

C:\Windows\SysWOW64\WScript.exe

"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\discord\s1YcuafMgFZcfjAcIZkCnl2ldkoG.vbe"

C:\Windows\SysWOW64\cmd.exe

C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\discord\6hjim1XI6LHKwsRzcTW0H.bat" "

C:\Users\Admin\AppData\Roaming\discord\discord.exe

"C:\Users\Admin\AppData\Roaming\\discord\discord.exe"

C:\Windows\SysWOW64\reg.exe

reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f

Network

Files

C:\Users\Admin\AppData\Roaming\discord\s1YcuafMgFZcfjAcIZkCnl2ldkoG.vbe

MD5 882088368dcd0aeacfbd6ecb5c6a4bf5
SHA1 ceff64387f97e543cccf1d1967256c5709771006
SHA256 95a165aaa06147d9e24952f1f497ebcfee7edc8fec0c8dc86cc4da4a63d23b0b
SHA512 8e05bd8f2d14b6c7fd5f923ede83b723ff26f93dc9d21fa6d21e4a3e097f4472abbfe7554911a0ffa48a950ec421f5ac5077a9b9b044c73e5ab5ad442f6ef830

C:\Users\Admin\AppData\Roaming\discord\6hjim1XI6LHKwsRzcTW0H.bat

MD5 1c21369bf1354782eb9c430fc1351179
SHA1 06d6a05de2c90239fd34e5eef61748cf0817f109
SHA256 ef5c3a480c4fbb67d912fa95920a71bc8b556ec7d270aabe9985dfa379369ab5
SHA512 9e75859de45774157a9be88e7914a87d234dff6e4794fb25d4d8bb04f55f17d289213547ec7cf48170a3e3f9a7cb965969136b9885bbac9ce92e867edec75e18

C:\Users\Admin\AppData\Roaming\discord\discord.exe

MD5 f6a2be982232660a4ef7923c9ea2a0f4
SHA1 49fd2c8a022c15d0286551fc81b2395e29079c7e
SHA256 db44adcc5a6919a3e2c56230a0b755ea6eb25cd9cfb4c7aceda76a9c3fad5fc2
SHA512 97e4dddd23a33ffb5678bc361ff00a8418cc3a6ce7ff86c1f76e29ecb4149f3fb1cb112fde77ab067a9fcda3ef46cfa2b9b6c2fbfc0d68371db34adf39b47284

memory/1900-12-0x00007FFF77513000-0x00007FFF77515000-memory.dmp

memory/1900-13-0x0000000000AF0000-0x0000000000DD4000-memory.dmp

memory/1900-14-0x0000000002E50000-0x0000000002E5E000-memory.dmp