remcos | ac9083b61eef653d53bb8e035dd48619764d008a00de6ba6d7761c698c8d5c75

General

Target

file.ps1
Size

1.3MB
MD5

e9555cbf01abdf1bd646705c3997e13c
SHA1

9a664ea36508bd4158a26529e9401202ba2811e4
SHA256

ac9083b61eef653d53bb8e035dd48619764d008a00de6ba6d7761c698c8d5c75
SHA512

c30a862f78274cdfccbaf1d4e7b1586f48b046ce575964a220dc4b315099eb462b522c4d12c741c8cc22fb00e6ee3532fa8ae577e7fa914283c33ed49fb58c94
SSDEEP

24576:Kl9R3rpl+v5MhC1jaysc54+xFB+ltbpQFRbut:cKx4QFvFZ8

Score

10^/10

remcos servert discovery execution rat

Malware Config

Extracted

Family

remcos

Botnet

ServerT

C2

vtrow.ydns.eu:2404

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
conhost.exe
copy_folder
Microsoft
delete_file
false
hide_file
true
hide_keylog_file
false
install_flag
false
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-OYYBQ1
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
Edge
take_screenshot_option
false
take_screenshot_time
5

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Remcos family
remcos

Executes dropped EXE 1 IoCs

pid	Process
4736	bYeROcgT.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4736 set thread context of 4568	4736	bYeROcgT.exe	91

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
3124	powershell.exe

System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	bYeROcgT.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RegAsm.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3124	powershell.exe
3124	powershell.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
4568	RegAsm.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3124	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4568	RegAsm.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3124 wrote to memory of 4736	3124	powershell.exe	87
PID 3124 wrote to memory of 4736	3124	powershell.exe	87
PID 3124 wrote to memory of 4736	3124	powershell.exe	87
PID 4736 wrote to memory of 4568	4736	bYeROcgT.exe	91
PID 4736 wrote to memory of 4568	4736	bYeROcgT.exe	91
PID 4736 wrote to memory of 4568	4736	bYeROcgT.exe	91
PID 4736 wrote to memory of 4568	4736	bYeROcgT.exe	91
PID 4736 wrote to memory of 4568	4736	bYeROcgT.exe	91
PID 4736 wrote to memory of 4568	4736	bYeROcgT.exe	91
PID 4736 wrote to memory of 4568	4736	bYeROcgT.exe	91
PID 4736 wrote to memory of 4568	4736	bYeROcgT.exe	91
PID 4736 wrote to memory of 4568	4736	bYeROcgT.exe	91
PID 4736 wrote to memory of 4568	4736	bYeROcgT.exe	91
PID 4736 wrote to memory of 4568	4736	bYeROcgT.exe	91
PID 4736 wrote to memory of 4568	4736	bYeROcgT.exe	91

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\file.ps1
1⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3124
- C:\Users\Admin\AppData\Local\Temp\bYeROcgT.exe
  "C:\Users\Admin\AppData\Local\Temp\bYeROcgT.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4736
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of SetWindowsHookEx
    PID:4568

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\remcos\logs.dat

Filesize
230B

MD5
0c294988a1e9b8a527a41b0ce2686eb6

SHA1
06d74be31b6742e417d222203226b265e8f0297c

SHA256
872a429302a3d902e9171029a177b056cd8be280799ffc1aec55d0ae6bd77c66

SHA512
61713924e7196b6105a1845a40f7529c2cfb902b87c230c85ead34b6e4a499463b09b54643b3cd6895e4e3054ad6b7c7bee022f4d7fa69a2199711e9e794915d

Download Submit
C:\ProgramData\remcos\logs.dat

Filesize
310B

MD5
a3397c5b86d3f2d2846e6c78fb3416cc

SHA1
2a1ee6417f3fb0b257c39cb6c9ecc82edde17455

SHA256
2a0cfa727f747d410f588f15d696c4017a0c6b74093b8fcf6be972ec510cd206

SHA512
a6ae9a92e337633c9355dd2f80b3b1de9c687a0fda8ef90ed70064acf60bba63689570b88c568e220600c299181ae93d4928b96bdeeca0da031c8895c059f83f

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_xrbjfbpl.hsa.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\bYeROcgT.exe

Filesize
543KB

MD5
cae7aa28cb07f464a1dbf0a3a7963e2f

SHA1
16958b6d1a6588322c31d84acef102c6629761f2

SHA256
d7d7c68fb6494dab85333278223bfd42baa156485bb4bdd9889488d0ec54bb08

SHA512
78ed7def8162252499ab4707236af210a7bdd18ecd5d0d624880dc1831c2e7acee456cc303f72fd52c2343a84e5d792d50aaea2bca2e2736929b637c30209a2a

Download Submit
memory/3124-0-0x00007FFB7D563000-0x00007FFB7D565000-memory.dmp

Filesize
8KB

Download
memory/3124-1-0x000002645E6F0000-0x000002645E712000-memory.dmp

Filesize
136KB

Download
memory/3124-11-0x00007FFB7D560000-0x00007FFB7E021000-memory.dmp

Filesize
10.8MB

Download
memory/3124-12-0x00007FFB7D560000-0x00007FFB7E021000-memory.dmp

Filesize
10.8MB

Download
memory/3124-26-0x00007FFB7D560000-0x00007FFB7E021000-memory.dmp

Filesize
10.8MB

Download
memory/4568-47-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4568-44-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4568-31-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4568-33-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4568-79-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4568-35-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4568-37-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4568-41-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4568-42-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4568-43-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4568-45-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4568-78-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4568-69-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4568-51-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4568-68-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4568-59-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4568-58-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4736-28-0x0000000000AE0000-0x0000000000B70000-memory.dmp

Filesize
576KB

Download
memory/4736-29-0x0000000005340000-0x0000000005346000-memory.dmp

Filesize
24KB

Download
memory/4736-27-0x000000007455E000-0x000000007455F000-memory.dmp

Filesize
4KB

Download
memory/4736-30-0x0000000074550000-0x0000000074D00000-memory.dmp

Filesize
7.7MB

Download
memory/4736-34-0x0000000074550000-0x0000000074D00000-memory.dmp

Filesize
7.7MB

Download

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