Malware Analysis Report

2024-11-13 13:42

Sample ID 240515-w92z8sed46
Target chainbrowserSession - Copie.exe
SHA256 3fe6c89a0fdadaf3172be13af4fad92f5f3e08c3bde723c8b6957ac68a3503ae
Tags
rat dcrat infostealer
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 Overview

score
10/10

SHA256

3fe6c89a0fdadaf3172be13af4fad92f5f3e08c3bde723c8b6957ac68a3503ae

Threat Level: Known bad

The file chainbrowserSession - Copie.exe was found to be: Known bad.

Malicious Activity Summary

rat dcrat infostealer

Dcrat family

Process spawned unexpected child process

DcRat

DCRat payload

DCRat payload

Executes dropped EXE

Drops file in Program Files directory

Drops file in Windows directory

Unsigned PE

Enumerates physical storage devices

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Suspicious behavior: GetForegroundWindowSpam

Creates scheduled task(s)

Uses Task Scheduler COM API

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-05-15 18:38

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

2024-05-15 18:38

Reported

2024-05-15 19:31

Platform

win10-20240404-en

Max time kernel

1159s

Max time network

1198s

Command Line

"C:\Users\Admin\AppData\Local\Temp\chainbrowserSession - Copie.exe"

Signatures

DcRat

rat infostealer dcrat

Process spawned unexpected child process

Description Indicator Process Target
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process N/A C:\Windows\system32\schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process N/A C:\Windows\system32\schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process N/A C:\Windows\system32\schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process N/A C:\Windows\system32\schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process N/A C:\Windows\system32\schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process N/A C:\Windows\system32\schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process N/A C:\Windows\system32\schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process N/A C:\Windows\system32\schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process N/A C:\Windows\system32\schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process N/A C:\Windows\system32\schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process N/A C:\Windows\system32\schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process N/A C:\Windows\system32\schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process N/A C:\Windows\system32\schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process N/A C:\Windows\system32\schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process N/A C:\Windows\system32\schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process N/A C:\Windows\system32\schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process N/A C:\Windows\system32\schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process N/A C:\Windows\system32\schtasks.exe

DCRat payload

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

Drops file in Program Files directory

Description Indicator Process Target
File created C:\Program Files (x86)\Windows NT\sppsvc.exe C:\Users\Admin\AppData\Local\Temp\chainbrowserSession - Copie.exe N/A
File created C:\Program Files\Common Files\DESIGNER\lsass.exe C:\Users\Admin\AppData\Local\Temp\chainbrowserSession - Copie.exe N/A
File created C:\Program Files (x86)\Windows Defender\ja-JP\smss.exe C:\Users\Admin\AppData\Local\Temp\chainbrowserSession - Copie.exe N/A
File created C:\Program Files (x86)\Windows Defender\ja-JP\69ddcba757bf72 C:\Users\Admin\AppData\Local\Temp\chainbrowserSession - Copie.exe N/A
File created C:\Program Files\Common Files\DESIGNER\6203df4a6bafc7 C:\Users\Admin\AppData\Local\Temp\chainbrowserSession - Copie.exe N/A
File created C:\Program Files (x86)\Reference Assemblies\Microsoft\System.exe C:\Users\Admin\AppData\Local\Temp\chainbrowserSession - Copie.exe N/A
File created C:\Program Files (x86)\Reference Assemblies\Microsoft\27d1bcfc3c54e0 C:\Users\Admin\AppData\Local\Temp\chainbrowserSession - Copie.exe N/A
File opened for modification C:\Program Files (x86)\Windows Defender\ja-JP\smss.exe C:\Users\Admin\AppData\Local\Temp\chainbrowserSession - Copie.exe N/A
File created C:\Program Files (x86)\Windows NT\0a1fd5f707cd16 C:\Users\Admin\AppData\Local\Temp\chainbrowserSession - Copie.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File created C:\Windows\security\EDP\Logs\InstallAgent.exe C:\Users\Admin\AppData\Local\Temp\chainbrowserSession - Copie.exe N/A
File created C:\Windows\security\EDP\Logs\200f98429d280b C:\Users\Admin\AppData\Local\Temp\chainbrowserSession - Copie.exe N/A

Enumerates physical storage devices

Suspicious behavior: GetForegroundWindowSpam

Description Indicator Process Target
N/A N/A C:\Program Files (x86)\Windows Defender\ja-JP\smss.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\chainbrowserSession - Copie.exe N/A
Token: SeDebugPrivilege N/A C:\Program Files (x86)\Windows Defender\ja-JP\smss.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\security\EDP\Logs\InstallAgent.exe N/A
Token: SeDebugPrivilege N/A C:\Recovery\WindowsRE\sysmon.exe N/A
Token: SeDebugPrivilege N/A C:\Program Files\Common Files\DESIGNER\lsass.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\security\EDP\Logs\InstallAgent.exe N/A
Token: SeDebugPrivilege N/A C:\Program Files (x86)\Windows NT\sppsvc.exe N/A
Token: SeDebugPrivilege N/A C:\Program Files (x86)\Reference Assemblies\Microsoft\System.exe N/A
Token: SeDebugPrivilege N/A C:\Program Files (x86)\Windows Defender\ja-JP\smss.exe N/A
Token: SeDebugPrivilege N/A C:\Recovery\WindowsRE\sysmon.exe N/A
Token: SeDebugPrivilege N/A C:\Program Files\Common Files\DESIGNER\lsass.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\security\EDP\Logs\InstallAgent.exe N/A
Token: SeDebugPrivilege N/A C:\Recovery\WindowsRE\sysmon.exe N/A
Token: SeDebugPrivilege N/A C:\Program Files\Common Files\DESIGNER\lsass.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\security\EDP\Logs\InstallAgent.exe N/A
Token: SeDebugPrivilege N/A C:\Program Files (x86)\Windows NT\sppsvc.exe N/A
Token: SeDebugPrivilege N/A C:\Program Files (x86)\Reference Assemblies\Microsoft\System.exe N/A

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\chainbrowserSession - Copie.exe

"C:\Users\Admin\AppData\Local\Temp\chainbrowserSession - Copie.exe"

C:\Windows\system32\schtasks.exe

schtasks.exe /create /tn "smsss" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Windows Defender\ja-JP\smss.exe'" /f

C:\Windows\system32\schtasks.exe

schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Defender\ja-JP\smss.exe'" /rl HIGHEST /f

C:\Windows\system32\schtasks.exe

schtasks.exe /create /tn "smsss" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Windows Defender\ja-JP\smss.exe'" /rl HIGHEST /f

C:\Windows\system32\schtasks.exe

schtasks.exe /create /tn "InstallAgentI" /sc MINUTE /mo 5 /tr "'C:\Windows\security\EDP\Logs\InstallAgent.exe'" /f

C:\Windows\system32\schtasks.exe

schtasks.exe /create /tn "InstallAgent" /sc ONLOGON /tr "'C:\Windows\security\EDP\Logs\InstallAgent.exe'" /rl HIGHEST /f

C:\Windows\system32\schtasks.exe

schtasks.exe /create /tn "InstallAgentI" /sc MINUTE /mo 8 /tr "'C:\Windows\security\EDP\Logs\InstallAgent.exe'" /rl HIGHEST /f

C:\Windows\system32\schtasks.exe

schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 7 /tr "'C:\Recovery\WindowsRE\sysmon.exe'" /f

C:\Windows\system32\schtasks.exe

schtasks.exe /create /tn "sysmon" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\sysmon.exe'" /rl HIGHEST /f

C:\Windows\system32\schtasks.exe

schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\sysmon.exe'" /rl HIGHEST /f

C:\Windows\system32\schtasks.exe

schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 9 /tr "'C:\Program Files (x86)\Windows NT\sppsvc.exe'" /f

C:\Windows\system32\schtasks.exe

schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows NT\sppsvc.exe'" /rl HIGHEST /f

C:\Windows\system32\schtasks.exe

schtasks.exe /create /tn "sppsvcs" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Windows NT\sppsvc.exe'" /rl HIGHEST /f

C:\Windows\system32\schtasks.exe

schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 9 /tr "'C:\Program Files\Common Files\DESIGNER\lsass.exe'" /f

C:\Windows\system32\schtasks.exe

schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Program Files\Common Files\DESIGNER\lsass.exe'" /rl HIGHEST /f

C:\Windows\system32\schtasks.exe

schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 6 /tr "'C:\Program Files\Common Files\DESIGNER\lsass.exe'" /rl HIGHEST /f

C:\Windows\system32\schtasks.exe

schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\System.exe'" /f

C:\Windows\system32\schtasks.exe

schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\System.exe'" /rl HIGHEST /f

C:\Windows\system32\schtasks.exe

schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 13 /tr "'C:\Recovery\WindowsRE\System.exe'" /rl HIGHEST /f

C:\Windows\system32\schtasks.exe

schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Reference Assemblies\Microsoft\System.exe'" /f

C:\Windows\system32\schtasks.exe

schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Program Files (x86)\Reference Assemblies\Microsoft\System.exe'" /rl HIGHEST /f

C:\Windows\system32\schtasks.exe

schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Reference Assemblies\Microsoft\System.exe'" /rl HIGHEST /f

C:\Program Files (x86)\Windows Defender\ja-JP\smss.exe

"C:\Program Files (x86)\Windows Defender\ja-JP\smss.exe"

C:\Windows\security\EDP\Logs\InstallAgent.exe

C:\Windows\security\EDP\Logs\InstallAgent.exe

C:\Recovery\WindowsRE\sysmon.exe

C:\Recovery\WindowsRE\sysmon.exe

C:\Program Files\Common Files\DESIGNER\lsass.exe

"C:\Program Files\Common Files\DESIGNER\lsass.exe"

C:\Windows\security\EDP\Logs\InstallAgent.exe

C:\Windows\security\EDP\Logs\InstallAgent.exe

C:\Program Files (x86)\Windows NT\sppsvc.exe

"C:\Program Files (x86)\Windows NT\sppsvc.exe"

C:\Program Files (x86)\Reference Assemblies\Microsoft\System.exe

"C:\Program Files (x86)\Reference Assemblies\Microsoft\System.exe"

C:\Program Files (x86)\Windows Defender\ja-JP\smss.exe

"C:\Program Files (x86)\Windows Defender\ja-JP\smss.exe"

C:\Recovery\WindowsRE\sysmon.exe

C:\Recovery\WindowsRE\sysmon.exe

C:\Program Files\Common Files\DESIGNER\lsass.exe

"C:\Program Files\Common Files\DESIGNER\lsass.exe"

C:\Windows\security\EDP\Logs\InstallAgent.exe

C:\Windows\security\EDP\Logs\InstallAgent.exe

C:\Recovery\WindowsRE\sysmon.exe

C:\Recovery\WindowsRE\sysmon.exe

C:\Program Files\Common Files\DESIGNER\lsass.exe

"C:\Program Files\Common Files\DESIGNER\lsass.exe"

C:\Windows\security\EDP\Logs\InstallAgent.exe

C:\Windows\security\EDP\Logs\InstallAgent.exe

C:\Program Files (x86)\Windows NT\sppsvc.exe

"C:\Program Files (x86)\Windows NT\sppsvc.exe"

C:\Program Files (x86)\Reference Assemblies\Microsoft\System.exe

"C:\Program Files (x86)\Reference Assemblies\Microsoft\System.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 a0982800.xsph.ru udp
RU 141.8.192.126:80 a0982800.xsph.ru tcp
RU 141.8.192.126:80 a0982800.xsph.ru tcp
US 8.8.8.8:53 126.192.8.141.in-addr.arpa udp
US 8.8.8.8:53 21.236.111.52.in-addr.arpa udp
RU 141.8.192.126:80 a0982800.xsph.ru tcp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 208.143.182.52.in-addr.arpa udp
US 8.8.8.8:53 79.190.18.2.in-addr.arpa udp
RU 141.8.192.126:80 a0982800.xsph.ru tcp
RU 141.8.192.126:80 a0982800.xsph.ru tcp

Files

memory/588-0-0x00007FFE32143000-0x00007FFE32144000-memory.dmp

memory/588-1-0x0000000000780000-0x0000000000856000-memory.dmp

memory/588-2-0x00007FFE32140000-0x00007FFE32B2C000-memory.dmp

memory/588-22-0x00007FFE32140000-0x00007FFE32B2C000-memory.dmp

C:\Program Files (x86)\Windows Defender\ja-JP\smss.exe

MD5 dcd1dbdf7c8bfb9263e5dda02b1bfa79
SHA1 0912a5fa7ac74c5e49d72a8a4d6957b063b1d31b
SHA256 3fe6c89a0fdadaf3172be13af4fad92f5f3e08c3bde723c8b6957ac68a3503ae
SHA512 d368e5f91365af67e46514425e13323f0ad2181d5fc1e790b2b5d17e9cf8c91f46bdf582550517f703b8232f6bd59598b37a41cd637f2d9c192317e8f0134ccc

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\InstallAgent.exe.log

MD5 d63ff49d7c92016feb39812e4db10419
SHA1 2307d5e35ca9864ffefc93acf8573ea995ba189b
SHA256 375076241775962f3edc08a8c72832a00920b427a4f3332528d91d21e909fa12
SHA512 00f8c8d0336d6575b956876183199624d6f4d2056f2c0aa633a6f17c516f22ee648062d9bc419254d84c459323e9424f0da8aed9dd4e16c2926e5ba30e797d8a