remcos | 81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547

General

Target

81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe
Size

35KB
MD5

46c7424bbc974b8071f30e2c6494612b
SHA1

7e957166a5a73c6e7ddf9af391fd1837f4339a99
SHA256

81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547
SHA512

b8463d95dd900c9a543cf7d9f9c34d6d557b84688c84c3b68f026ffd3ba5fe909b785a7de69d6c75ade8327e059840d7fdaa27634df357e8aad591fbc7a40544

Score

10^/10

remcos remotehost persistence rat spyware stealer

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

vivald21.hopto.org:9955

Attributes

audio_folder
MicRecords
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
remcos.exe
copy_folder
Remcos
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
false
install_path
%AppData%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%AppData%
mouse_option
false
mutex
Remcos-ZCNRVQ
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
Remcos
take_screenshot_option
false
take_screenshot_time
5
take_screenshot_title

Signatures

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

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1809750270-3141839489-3074374771-1000\Control Panel\International\Geo\Nation	81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1809750270-3141839489-3074374771-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\weare = "\"C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Windows\\Start Menu\\Programs\\weare.exe\""	81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4580 set thread context of 4436	4580	81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe	89

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2560	timeout.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4580	81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe
4580	81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4580	81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4436	81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 4580 wrote to memory of 4008	4580	81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe	82
PID 4580 wrote to memory of 4008	4580	81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe	82
PID 4580 wrote to memory of 4008	4580	81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe	82
PID 4008 wrote to memory of 2560	4008	cmd.exe	84
PID 4008 wrote to memory of 2560	4008	cmd.exe	84
PID 4008 wrote to memory of 2560	4008	cmd.exe	84
PID 4580 wrote to memory of 4436	4580	81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe	89
PID 4580 wrote to memory of 4436	4580	81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe	89
PID 4580 wrote to memory of 4436	4580	81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe	89
PID 4580 wrote to memory of 4436	4580	81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe	89
PID 4580 wrote to memory of 4436	4580	81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe	89
PID 4580 wrote to memory of 4436	4580	81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe	89
PID 4580 wrote to memory of 4436	4580	81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe	89
PID 4580 wrote to memory of 4436	4580	81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe	89
PID 4580 wrote to memory of 4436	4580	81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe	89
PID 4580 wrote to memory of 4436	4580	81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe	89
PID 4580 wrote to memory of 4436	4580	81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe	89
PID 4580 wrote to memory of 4436	4580	81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe	89

C:\Users\Admin\AppData\Local\Temp\81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe
"C:\Users\Admin\AppData\Local\Temp\81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4580
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c timeout 10
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4008
- - C:\Windows\SysWOW64\timeout.exe
    timeout 10
    3⤵
    - Delays execution with timeout.exe
    PID:2560
- C:\Users\Admin\AppData\Local\Temp\81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe
  C:\Users\Admin\AppData\Local\Temp\81bc33ce9bf2c1eaec168f5a5a4c2da715a2fcbc8972daa23834e22e3d27c547.exe
  2⤵
  - Suspicious use of SetWindowsHookEx
  PID:4436

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Credentials in Files

1

T1081

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/4436-138-0x0000000000400000-0x000000000047B000-memory.dmp

Filesize
492KB

Download
memory/4436-142-0x0000000000400000-0x000000000047B000-memory.dmp

Filesize
492KB

Download
memory/4436-141-0x0000000000400000-0x000000000047B000-memory.dmp

Filesize
492KB

Download
memory/4436-140-0x0000000000400000-0x000000000047B000-memory.dmp

Filesize
492KB

Download
memory/4436-139-0x0000000000400000-0x000000000047B000-memory.dmp

Filesize
492KB

Download
memory/4580-133-0x0000000006A20000-0x0000000006A3E000-memory.dmp

Filesize
120KB

Download
memory/4580-136-0x0000000006CA0000-0x0000000006D32000-memory.dmp

Filesize
584KB

Download
memory/4580-130-0x0000000000AB0000-0x0000000000AC0000-memory.dmp

Filesize
64KB

Download
memory/4580-132-0x0000000005440000-0x00000000054B6000-memory.dmp

Filesize
472KB

Download
memory/4580-131-0x0000000005930000-0x0000000005ED4000-memory.dmp

Filesize
5.6MB

Download

Analysis

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