remcos | be9fe1cd741c239b0ce1b3edc3fb8f87445acf71ab2fb5346197e50c2da66968

General

Target
b4b5917ae4c8231d912bd02bfccfe11a.exe
Size 1.1MB
Sample221022-e8s79sagfk
SHA256 be9fe1cd741c239b0ce1b3edc3fb8f87445acf71ab2fb5346197e50c2da66968
MD5 b4b5917ae4c8231d912bd02bfccfe11a
SHA1 c8d19594e9800f9a5a0c8126ce2514d6f8f9d45b
SHA512 c6928b42412d84d686e47dcd7915f2f165dd81284cdd1b0b55d309b8552d6e1a867fb1838fbd44c47881fca7b9b371e723dcbffb39c14f02e3748968a1d8ae8f
SSDEEP 24576:sQkTuE0RAaMZqeaZWFJQEgwSdqZC62+cN2qd9H+fPpLnSlF:sBEeXqeaZWFJQtdqEF9HsnkF
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

remcos xp persistence rat

Malware Config

Extracted

Family

remcos

Botnet

XP

C2

xpremcuz300622.ddns.net:3542

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
oos.exe
delete_file
false
hide_file
true
hide_keylog_file
false
install_flag
true
install_path
%AppData%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Remcos-MMP2I7
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
kkl
take_screenshot_option
false
take_screenshot_time
5

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-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation	b4b5917ae4c8231d912bd02bfccfe11a.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\kkl = "\"C:\\Users\\Admin\\AppData\\Roaming\\oos.exe\""	b4b5917ae4c8231d912bd02bfccfe11a.exe
Key created	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Windows\CurrentVersion\Run\	b4b5917ae4c8231d912bd02bfccfe11a.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\kkl = "\"C:\\Users\\Admin\\AppData\\Roaming\\oos.exe\""	b4b5917ae4c8231d912bd02bfccfe11a.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\	b4b5917ae4c8231d912bd02bfccfe11a.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4860 set thread context of 2832	4860	b4b5917ae4c8231d912bd02bfccfe11a.exe	91

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000_Classes\Local Settings	b4b5917ae4c8231d912bd02bfccfe11a.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4860 wrote to memory of 2832	4860	b4b5917ae4c8231d912bd02bfccfe11a.exe	91
PID 4860 wrote to memory of 2832	4860	b4b5917ae4c8231d912bd02bfccfe11a.exe	91
PID 4860 wrote to memory of 2832	4860	b4b5917ae4c8231d912bd02bfccfe11a.exe	91
PID 4860 wrote to memory of 2832	4860	b4b5917ae4c8231d912bd02bfccfe11a.exe	91
PID 4860 wrote to memory of 2832	4860	b4b5917ae4c8231d912bd02bfccfe11a.exe	91
PID 4860 wrote to memory of 2832	4860	b4b5917ae4c8231d912bd02bfccfe11a.exe	91
PID 4860 wrote to memory of 2832	4860	b4b5917ae4c8231d912bd02bfccfe11a.exe	91
PID 4860 wrote to memory of 2832	4860	b4b5917ae4c8231d912bd02bfccfe11a.exe	91
PID 4860 wrote to memory of 2832	4860	b4b5917ae4c8231d912bd02bfccfe11a.exe	91
PID 4860 wrote to memory of 2832	4860	b4b5917ae4c8231d912bd02bfccfe11a.exe	91
PID 4860 wrote to memory of 2832	4860	b4b5917ae4c8231d912bd02bfccfe11a.exe	91
PID 4860 wrote to memory of 2832	4860	b4b5917ae4c8231d912bd02bfccfe11a.exe	91
PID 2832 wrote to memory of 4176	2832	b4b5917ae4c8231d912bd02bfccfe11a.exe	92
PID 2832 wrote to memory of 4176	2832	b4b5917ae4c8231d912bd02bfccfe11a.exe	92
PID 2832 wrote to memory of 4176	2832	b4b5917ae4c8231d912bd02bfccfe11a.exe	92

C:\Users\Admin\AppData\Local\Temp\b4b5917ae4c8231d912bd02bfccfe11a.exe
"C:\Users\Admin\AppData\Local\Temp\b4b5917ae4c8231d912bd02bfccfe11a.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4860
- C:\Users\Admin\AppData\Local\Temp\b4b5917ae4c8231d912bd02bfccfe11a.exe
  "C:\Users\Admin\AppData\Local\Temp\b4b5917ae4c8231d912bd02bfccfe11a.exe"
  2⤵
  - Checks computer location settings
  - Adds Run key to start application
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:2832
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
    3⤵
    PID:4176

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

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/2832-141-0x0000000000400000-0x000000000047E000-memory.dmp

Download

memory/2832-139-0x0000000000400000-0x000000000047E000-memory.dmp

Download

memory/2832-140-0x0000000000400000-0x000000000047E000-memory.dmp

Download

memory/2832-142-0x0000000000400000-0x000000000047E000-memory.dmp

Download

memory/2832-144-0x0000000000400000-0x000000000047E000-memory.dmp

Download

memory/4860-133-0x00000000059A0000-0x0000000005F44000-memory.dmp

Download

memory/4860-134-0x00000000053F0000-0x0000000005482000-memory.dmp

Download

memory/4860-135-0x00000000055A0000-0x00000000055AA000-memory.dmp

Download

memory/4860-136-0x00000000012F0000-0x000000000138C000-memory.dmp

Download

memory/4860-137-0x0000000009080000-0x00000000090E6000-memory.dmp

Download

memory/4860-132-0x00000000008D0000-0x00000000009E4000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads