remcos | 3a4b5b4f8fd60dd3028706daa87d996b0690f6ad320540139fd2e0c66d0c432b

General

Target

3a4b5b4f8fd60dd3028706daa87d996b0690f6ad320540139fd2e0c66d0c432b.exe
Size

588KB
MD5

958eb87d60959a12563ed9af47d911a5
SHA1

6c7d310a1188cf1be548328b67e9df407a8f59ab
SHA256

3a4b5b4f8fd60dd3028706daa87d996b0690f6ad320540139fd2e0c66d0c432b
SHA512

abff3aca43311bf2d72c6f1988a8ccafbbba4932c386d2a60962713a57c1d362b982297b263f292d71feffbe70fc34bfefbfb8b785c6520b7d48d84be6de7e8f

Score

10^/10

remcos remotehost persistence rat

Malware Config

Extracted

Family

remcos

Version

2.4.5 Pro

Botnet

RemoteHost

C2

185.244.31.74:6666

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-TRR060
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
wikipedia;solitaire;

Signatures

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

Executes dropped EXE 2 IoCs

pid	Process
4684	filename.exe
3544	filename.exe

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-1-5-21-2632097139-1792035885-811742494-1000\Control Panel\International\Geo\Nation	3a4b5b4f8fd60dd3028706daa87d996b0690f6ad320540139fd2e0c66d0c432b.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Software\Microsoft\Windows\CurrentVersion\Run	WScript.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Registry Key Name = "C:\\Users\\Admin\\AppData\\Local\\Temp\\subfolder\\filename.vbs -0"	WScript.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4684 set thread context of 3544	4684	filename.exe	84

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-1-5-21-2632097139-1792035885-811742494-1000_Classes\Local Settings	3a4b5b4f8fd60dd3028706daa87d996b0690f6ad320540139fd2e0c66d0c432b.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4028	3a4b5b4f8fd60dd3028706daa87d996b0690f6ad320540139fd2e0c66d0c432b.exe
4684	filename.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 4028 wrote to memory of 4640	4028	3a4b5b4f8fd60dd3028706daa87d996b0690f6ad320540139fd2e0c66d0c432b.exe	82
PID 4028 wrote to memory of 4640	4028	3a4b5b4f8fd60dd3028706daa87d996b0690f6ad320540139fd2e0c66d0c432b.exe	82
PID 4028 wrote to memory of 4640	4028	3a4b5b4f8fd60dd3028706daa87d996b0690f6ad320540139fd2e0c66d0c432b.exe	82
PID 4028 wrote to memory of 4684	4028	3a4b5b4f8fd60dd3028706daa87d996b0690f6ad320540139fd2e0c66d0c432b.exe	83
PID 4028 wrote to memory of 4684	4028	3a4b5b4f8fd60dd3028706daa87d996b0690f6ad320540139fd2e0c66d0c432b.exe	83
PID 4028 wrote to memory of 4684	4028	3a4b5b4f8fd60dd3028706daa87d996b0690f6ad320540139fd2e0c66d0c432b.exe	83
PID 4684 wrote to memory of 3544	4684	filename.exe	84
PID 4684 wrote to memory of 3544	4684	filename.exe	84
PID 4684 wrote to memory of 3544	4684	filename.exe	84

C:\Users\Admin\AppData\Local\Temp\3a4b5b4f8fd60dd3028706daa87d996b0690f6ad320540139fd2e0c66d0c432b.exe
"C:\Users\Admin\AppData\Local\Temp\3a4b5b4f8fd60dd3028706daa87d996b0690f6ad320540139fd2e0c66d0c432b.exe"
1⤵
- Checks computer location settings
- Modifies registry class
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4028
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\subfolder\filename.vbs"
  2⤵
  - Adds Run key to start application
  PID:4640
- C:\Users\Admin\AppData\Local\Temp\subfolder\filename.exe
  "C:\Users\Admin\AppData\Local\Temp\subfolder\filename.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4684
- - C:\Users\Admin\AppData\Local\Temp\subfolder\filename.exe
    C:\Users\Admin\AppData\Local\Temp\subfolder\filename.exe"
    3⤵
    - Executes dropped EXE
    PID:3544

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\subfolder\filename.exe

Filesize
588KB

MD5
958eb87d60959a12563ed9af47d911a5

SHA1
6c7d310a1188cf1be548328b67e9df407a8f59ab

SHA256
3a4b5b4f8fd60dd3028706daa87d996b0690f6ad320540139fd2e0c66d0c432b

SHA512
abff3aca43311bf2d72c6f1988a8ccafbbba4932c386d2a60962713a57c1d362b982297b263f292d71feffbe70fc34bfefbfb8b785c6520b7d48d84be6de7e8f

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

Filesize
588KB

MD5
958eb87d60959a12563ed9af47d911a5

SHA1
6c7d310a1188cf1be548328b67e9df407a8f59ab

SHA256
3a4b5b4f8fd60dd3028706daa87d996b0690f6ad320540139fd2e0c66d0c432b

SHA512
abff3aca43311bf2d72c6f1988a8ccafbbba4932c386d2a60962713a57c1d362b982297b263f292d71feffbe70fc34bfefbfb8b785c6520b7d48d84be6de7e8f

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

Filesize
588KB

MD5
958eb87d60959a12563ed9af47d911a5

SHA1
6c7d310a1188cf1be548328b67e9df407a8f59ab

SHA256
3a4b5b4f8fd60dd3028706daa87d996b0690f6ad320540139fd2e0c66d0c432b

SHA512
abff3aca43311bf2d72c6f1988a8ccafbbba4932c386d2a60962713a57c1d362b982297b263f292d71feffbe70fc34bfefbfb8b785c6520b7d48d84be6de7e8f

Download Submit
C:\Users\Admin\AppData\Local\Temp\subfolder\filename.vbs

Filesize
1024B

MD5
e6ddff0cba9efe622cb701d417f4781d

SHA1
44ae0fc753ec76e1ce3840c629176c4f6c6945cc

SHA256
5f513b6f4be4f95860a0d52f0f400d8e3c2804bd6534e8bc1ddc8de4f7afaf43

SHA512
7ae88174d2bb42eedcd03df22da775a46dc6ee6f90a37d606f91d68e9c4400a942574f9a38404a1ed6e86445cd63a7e29a17b3df66f547444a7192e3de3eb9ce

Download Submit
memory/3544-161-0x00000000005D0000-0x00000000005D7000-memory.dmp

Filesize
28KB

Download
memory/3544-160-0x0000000077310000-0x00000000774B3000-memory.dmp

Filesize
1.6MB

Download
memory/3544-159-0x00007FFD60A10000-0x00007FFD60C05000-memory.dmp

Filesize
2.0MB

Download
memory/3544-155-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/3544-153-0x0000000000400000-0x0000000000497000-memory.dmp

Filesize
604KB

Download
memory/3544-152-0x00000000005D0000-0x00000000005D7000-memory.dmp

Filesize
28KB

Download
memory/4028-141-0x00007FFD60A10000-0x00007FFD60C05000-memory.dmp

Filesize
2.0MB

Download
memory/4028-142-0x0000000077310000-0x00000000774B3000-memory.dmp

Filesize
1.6MB

Download
memory/4028-132-0x0000000002260000-0x0000000002267000-memory.dmp

Filesize
28KB

Download
memory/4028-139-0x0000000002260000-0x0000000002267000-memory.dmp

Filesize
28KB

Download
memory/4028-134-0x0000000077310000-0x00000000774B3000-memory.dmp

Filesize
1.6MB

Download
memory/4028-133-0x00007FFD60A10000-0x00007FFD60C05000-memory.dmp

Filesize
2.0MB

Download
memory/4684-146-0x00007FFD60A10000-0x00007FFD60C05000-memory.dmp

Filesize
2.0MB

Download
memory/4684-147-0x0000000077310000-0x00000000774B3000-memory.dmp

Filesize
1.6MB

Download
memory/4684-145-0x0000000002020000-0x0000000002027000-memory.dmp

Filesize
28KB

Download
memory/4684-151-0x0000000077310000-0x00000000774B3000-memory.dmp

Filesize
1.6MB

Download
memory/4684-150-0x0000000002020000-0x0000000002027000-memory.dmp

Filesize
28KB

Download

Analysis

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