remcos | 4191897f0eb05e71e982d4ab0289ddce7e769a09e125d09e05b170824a3efbc6

General

Target

EASTERS.exe
Size

128KB
MD5

4c884f97e78f79fc6d179fde087de2d3
SHA1

1fac33ee2e51cc0d358a53b1633536ca457bb86e
SHA256

4191897f0eb05e71e982d4ab0289ddce7e769a09e125d09e05b170824a3efbc6
SHA512

a3029d94f76ee2c435a01d23b52ad48beb4b9d6fa69ec013c13a6622f74d4a9de60d83b6e0c0110c1ad88cacafd3beaa3ce8f4e85ad893774765e39b56432b91

Score

10^/10

remcos persistence rat

Malware Config

Extracted

Family

remcos

C2

osisego.ddns.net:2405

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Executes dropped EXE 1 IoCs

Processes:

remcos.exe

pid process

1672 remcos.exe
Loads dropped DLL 2 IoCs

Processes:

cmd.exe

pid process

1696 cmd.exe
1696 cmd.exe

pid	process
1672	remcos.exe

pid	process
1696	cmd.exe
1696	cmd.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

EASTERS.exeremcos.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\Remcos\\remcos.exe\""	EASTERS.exe
Key created	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Windows\CurrentVersion\Run\	remcos.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\Remcos\\remcos.exe\""	remcos.exe
Key created	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Windows\CurrentVersion\Run\	EASTERS.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

remcos.exe

pid process

1672 remcos.exe

pid	process
1672	remcos.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

EASTERS.exeWScript.execmd.exe

description	pid	process	target process
PID 1064 wrote to memory of 2000	1064	EASTERS.exe	WScript.exe
PID 1064 wrote to memory of 2000	1064	EASTERS.exe	WScript.exe
PID 1064 wrote to memory of 2000	1064	EASTERS.exe	WScript.exe
PID 1064 wrote to memory of 2000	1064	EASTERS.exe	WScript.exe
PID 2000 wrote to memory of 1696	2000	WScript.exe	cmd.exe
PID 2000 wrote to memory of 1696	2000	WScript.exe	cmd.exe
PID 2000 wrote to memory of 1696	2000	WScript.exe	cmd.exe
PID 2000 wrote to memory of 1696	2000	WScript.exe	cmd.exe
PID 1696 wrote to memory of 1672	1696	cmd.exe	remcos.exe
PID 1696 wrote to memory of 1672	1696	cmd.exe	remcos.exe
PID 1696 wrote to memory of 1672	1696	cmd.exe	remcos.exe
PID 1696 wrote to memory of 1672	1696	cmd.exe	remcos.exe

C:\Users\Admin\AppData\Local\Temp\EASTERS.exe
"C:\Users\Admin\AppData\Local\Temp\EASTERS.exe"
1⤵
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:1064

C:\Windows\SysWOW64\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
2⤵
- Suspicious use of WriteProcessMemory
PID:2000

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe"
3⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1696

C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
4⤵
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of SetWindowsHookEx
PID:1672

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\install.vbs
MD5
b92d64fe5b1d1f59df4b738262aea8df

SHA1
c8fb1981759c2d9bb2ec91b705985fba5fc7af63

SHA256
fa20e9aab03dc8e9f1910aaf0cf42662379fa16ae3a22642084fb97fa3d4f83a

SHA512
2566248b93c0cfb0414f033b8dd18bbd4f88180093eac2861107289bcb4ee160f9593706ff1f7d1f2e4ecea430d67a5a2897551a4f9ebd82b707243e300520e2

Download Submit
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
MD5
4c884f97e78f79fc6d179fde087de2d3

SHA1
1fac33ee2e51cc0d358a53b1633536ca457bb86e

SHA256
4191897f0eb05e71e982d4ab0289ddce7e769a09e125d09e05b170824a3efbc6

SHA512
a3029d94f76ee2c435a01d23b52ad48beb4b9d6fa69ec013c13a6622f74d4a9de60d83b6e0c0110c1ad88cacafd3beaa3ce8f4e85ad893774765e39b56432b91

Download Submit
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
MD5
4c884f97e78f79fc6d179fde087de2d3

SHA1
1fac33ee2e51cc0d358a53b1633536ca457bb86e

SHA256
4191897f0eb05e71e982d4ab0289ddce7e769a09e125d09e05b170824a3efbc6

SHA512
a3029d94f76ee2c435a01d23b52ad48beb4b9d6fa69ec013c13a6622f74d4a9de60d83b6e0c0110c1ad88cacafd3beaa3ce8f4e85ad893774765e39b56432b91

Download Submit
\Users\Admin\AppData\Roaming\Remcos\remcos.exe
MD5
4c884f97e78f79fc6d179fde087de2d3

SHA1
1fac33ee2e51cc0d358a53b1633536ca457bb86e

SHA256
4191897f0eb05e71e982d4ab0289ddce7e769a09e125d09e05b170824a3efbc6

SHA512
a3029d94f76ee2c435a01d23b52ad48beb4b9d6fa69ec013c13a6622f74d4a9de60d83b6e0c0110c1ad88cacafd3beaa3ce8f4e85ad893774765e39b56432b91

Download Submit
\Users\Admin\AppData\Roaming\Remcos\remcos.exe
MD5
4c884f97e78f79fc6d179fde087de2d3

SHA1
1fac33ee2e51cc0d358a53b1633536ca457bb86e

SHA256
4191897f0eb05e71e982d4ab0289ddce7e769a09e125d09e05b170824a3efbc6

SHA512
a3029d94f76ee2c435a01d23b52ad48beb4b9d6fa69ec013c13a6622f74d4a9de60d83b6e0c0110c1ad88cacafd3beaa3ce8f4e85ad893774765e39b56432b91

Download Submit
memory/1064-2-0x0000000076101000-0x0000000076103000-memory.dmp

Filesize
8KB

Download
memory/1672-11-0x0000000000000000-mapping.dmp

Download
memory/1696-6-0x0000000000000000-mapping.dmp

Download
memory/2000-3-0x0000000000000000-mapping.dmp

Download
memory/2000-7-0x0000000002660000-0x0000000002664000-memory.dmp

Filesize
16KB

Download

Analysis

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