remcos | 4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9

General

Target

4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe
Size

825KB
MD5

730aa05f5d66b1ab88a81ff99816b410
SHA1

1325703ac2e90db498bacbc139ef7ee453abfdfa
SHA256

4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9
SHA512

6311daade37802bc8c6b9d380cce5e669284559fe6c40aaeab80ef2438c002925bc7a88f920c06eeffd3b78d7500c22b5051984df507fc14e1a92645dc5500a6

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
Executes dropped EXE 2 IoCs

Processes:

oos.exeoos.exe

pid process

3572 oos.exe
3800 oos.exe

pid	process
3572	oos.exe
3800	oos.exe

Checks computer location settings 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exeWScript.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000\Control Panel\International\Geo\Nation	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000\Control Panel\International\Geo\Nation	WScript.exe

Adds Run key to start application 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

oos.exe4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\kkl = "\"C:\\Users\\Admin\\AppData\\Roaming\\oos.exe\""	oos.exe
Key created	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000\Software\Microsoft\Windows\CurrentVersion\Run\	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\kkl = "\"C:\\Users\\Admin\\AppData\\Roaming\\oos.exe\""	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\kkl = "\"C:\\Users\\Admin\\AppData\\Roaming\\oos.exe\""	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe
Key created	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000\Software\Microsoft\Windows\CurrentVersion\Run\	oos.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\kkl = "\"C:\\Users\\Admin\\AppData\\Roaming\\oos.exe\""	oos.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\	oos.exe

Suspicious use of SetThreadContext 2 IoCs

Processes:

4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exeoos.exe

description	pid	process	target process
PID 2548 set thread context of 3664	2548	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe
PID 3572 set thread context of 3800	3572	oos.exe	oos.exe

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

Processes:

4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000_Classes\Local Settings	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

oos.exe

pid process

3800 oos.exe

pid	process
3800	oos.exe

Suspicious use of WriteProcessMemory 33 IoCs

Processes:

4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exeWScript.execmd.exeoos.exe

description	pid	process	target process
PID 2548 wrote to memory of 3664	2548	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe
PID 2548 wrote to memory of 3664	2548	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe
PID 2548 wrote to memory of 3664	2548	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe
PID 2548 wrote to memory of 3664	2548	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe
PID 2548 wrote to memory of 3664	2548	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe
PID 2548 wrote to memory of 3664	2548	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe
PID 2548 wrote to memory of 3664	2548	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe
PID 2548 wrote to memory of 3664	2548	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe
PID 2548 wrote to memory of 3664	2548	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe
PID 2548 wrote to memory of 3664	2548	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe
PID 2548 wrote to memory of 3664	2548	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe
PID 2548 wrote to memory of 3664	2548	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe
PID 3664 wrote to memory of 2020	3664	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe	WScript.exe
PID 3664 wrote to memory of 2020	3664	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe	WScript.exe
PID 3664 wrote to memory of 2020	3664	4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe	WScript.exe
PID 2020 wrote to memory of 4996	2020	WScript.exe	cmd.exe
PID 2020 wrote to memory of 4996	2020	WScript.exe	cmd.exe
PID 2020 wrote to memory of 4996	2020	WScript.exe	cmd.exe
PID 4996 wrote to memory of 3572	4996	cmd.exe	oos.exe
PID 4996 wrote to memory of 3572	4996	cmd.exe	oos.exe
PID 4996 wrote to memory of 3572	4996	cmd.exe	oos.exe
PID 3572 wrote to memory of 3800	3572	oos.exe	oos.exe
PID 3572 wrote to memory of 3800	3572	oos.exe	oos.exe
PID 3572 wrote to memory of 3800	3572	oos.exe	oos.exe
PID 3572 wrote to memory of 3800	3572	oos.exe	oos.exe
PID 3572 wrote to memory of 3800	3572	oos.exe	oos.exe
PID 3572 wrote to memory of 3800	3572	oos.exe	oos.exe
PID 3572 wrote to memory of 3800	3572	oos.exe	oos.exe
PID 3572 wrote to memory of 3800	3572	oos.exe	oos.exe
PID 3572 wrote to memory of 3800	3572	oos.exe	oos.exe
PID 3572 wrote to memory of 3800	3572	oos.exe	oos.exe
PID 3572 wrote to memory of 3800	3572	oos.exe	oos.exe
PID 3572 wrote to memory of 3800	3572	oos.exe	oos.exe

C:\Users\Admin\AppData\Local\Temp\4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe
"C:\Users\Admin\AppData\Local\Temp\4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2548

C:\Users\Admin\AppData\Local\Temp\4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe
"C:\Users\Admin\AppData\Local\Temp\4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9.exe"
2⤵
- Checks computer location settings
- Adds Run key to start application
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3664

C:\Windows\SysWOW64\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
3⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2020

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\oos.exe"
4⤵
- Suspicious use of WriteProcessMemory
PID:4996

C:\Users\Admin\AppData\Roaming\oos.exe
C:\Users\Admin\AppData\Roaming\oos.exe
5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3572

C:\Users\Admin\AppData\Roaming\oos.exe
"C:\Users\Admin\AppData\Roaming\oos.exe"
6⤵
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of SetWindowsHookEx
PID:3800

Network

MITRE ATT&CK Matrix ATT&CK 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

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\install.vbs
Filesize
398B

MD5
a5d3440f90cbfae712166e20870eaed7

SHA1
cc1e1a2945eb2ad475234344f7527ad9e9873647

SHA256
960a570da95b8d16809cbcc18e8ca4d81e16cb666354ddc1d572daf93f291f02

SHA512
d3136a280fbb326ccc5cb5ab1214aed8ccd6baa7f3f89ef9e0b5bf391a957dab2c121640bb056e6cbda0594f83133c4dbb4e1e2f0e290b44a401cd2cf8cfd4aa

Download Submit
C:\Users\Admin\AppData\Roaming\oos.exe
Filesize
825KB

MD5
730aa05f5d66b1ab88a81ff99816b410

SHA1
1325703ac2e90db498bacbc139ef7ee453abfdfa

SHA256
4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9

SHA512
6311daade37802bc8c6b9d380cce5e669284559fe6c40aaeab80ef2438c002925bc7a88f920c06eeffd3b78d7500c22b5051984df507fc14e1a92645dc5500a6

Download Submit
C:\Users\Admin\AppData\Roaming\oos.exe
Filesize
825KB

MD5
730aa05f5d66b1ab88a81ff99816b410

SHA1
1325703ac2e90db498bacbc139ef7ee453abfdfa

SHA256
4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9

SHA512
6311daade37802bc8c6b9d380cce5e669284559fe6c40aaeab80ef2438c002925bc7a88f920c06eeffd3b78d7500c22b5051984df507fc14e1a92645dc5500a6

Download Submit
C:\Users\Admin\AppData\Roaming\oos.exe
Filesize
825KB

MD5
730aa05f5d66b1ab88a81ff99816b410

SHA1
1325703ac2e90db498bacbc139ef7ee453abfdfa

SHA256
4fb64a4a1e0876e8cdd9afcd6c62c908f1b2441692dcd83c430b4606272689d9

SHA512
6311daade37802bc8c6b9d380cce5e669284559fe6c40aaeab80ef2438c002925bc7a88f920c06eeffd3b78d7500c22b5051984df507fc14e1a92645dc5500a6

Download Submit
memory/2020-140-0x0000000000000000-mapping.dmp

Download
memory/2548-130-0x0000000000270000-0x0000000000344000-memory.dmp

Filesize
848KB

Download
memory/2548-134-0x0000000005730000-0x0000000005796000-memory.dmp

Filesize
408KB

Download
memory/2548-131-0x0000000004ED0000-0x0000000004F62000-memory.dmp

Filesize
584KB

Download
memory/2548-133-0x0000000005C30000-0x00000000061D4000-memory.dmp

Filesize
5.6MB

Download
memory/2548-132-0x0000000005210000-0x00000000052AC000-memory.dmp

Filesize
624KB

Download
memory/3572-144-0x0000000000000000-mapping.dmp

Download
memory/3664-135-0x0000000000000000-mapping.dmp

Download
memory/3664-136-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3664-137-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3664-138-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3664-139-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3664-141-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3800-147-0x0000000000000000-mapping.dmp

Download
memory/3800-150-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3800-151-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3800-152-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3800-153-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/4996-143-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads