remcos | ec9fa98b9c0a55ad5d3b51bf6148b6e2041d1a14c36b4ad98caa9438bc3854e9

Analysis

max time kernel
150s
max time network
144s
platform
windows10-2004_x64
resource
win10v2004-20250314-en
resource tags

arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
submitted
22/03/2025, 06:18

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General

Target

ff03c0c01a5acef84aa5acdf32b445cd.exe
Size

135KB
MD5

ff03c0c01a5acef84aa5acdf32b445cd
SHA1

77af93279f4ae2982295644f6ce973a3ebb7ff9b
SHA256

0b6f9ec209f440c66c54faa378f8208e8aa8d996156161f52d580dcdcaeb3e08
SHA512

b1ea91b7dfe6a3ce52ffd351324c5f623a3dd33788ff0973240b498b0da167121b142bb8642f70692e6f5ff321a5fe6cf647231a520880d7f48b14e46b4cd61f
SSDEEP

1536:ITHiPBX4nDzMyRXGHrc9YRHqbTypgpmb5Q+ZReSdhk/J+YLgD3mrxb53cSuYQjK4:xPd4n/M+WLcilrpgGH/GwY87mVmIXI

Score

10^/10

remcos host discovery persistence rat

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

Host

systemcontrol.ddns.net:45000

systemcontrol2.ddns.net:45000

Attributes

audio_folder
audio
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
5
copy_file
OfficeUpgrade.exe
copy_folder
OfficeUpgrade
delete_file
false
hide_file
true
hide_keylog_file
true
install_flag
false
install_path
%AppData%
keylog_crypt
true
keylog_file
Upgrader.dat
keylog_flag
false
keylog_folder
Upgrader
keylog_path
%AppData%
mouse_option
false
mutex
req_khauflaoyr
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screens
screenshot_path
%AppData%
screenshot_time
1
startup_value
OfficeUpgrade
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

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-1-5-21-814918696-1585701690-3140955116-1000\Control Panel\International\Geo\Nation	ff03c0c01a5acef84aa5acdf32b445cd.exe

Executes dropped EXE 2 IoCs

pid	Process
5276	wn2ra4ohzdr.exe
1516	wn2ra4ohzdr.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-814918696-1585701690-3140955116-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\raj4dkhhiap = "C:\\Users\\Admin\\AppData\\Roaming\\raj4dkhhiap\\wn2ra4ohzdr.exe"	ff03c0c01a5acef84aa5acdf32b445cd.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 5276 set thread context of 1516	5276	wn2ra4ohzdr.exe	97

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 3 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	ff03c0c01a5acef84aa5acdf32b445cd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wn2ra4ohzdr.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wn2ra4ohzdr.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1516	wn2ra4ohzdr.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 5824 wrote to memory of 5276	5824	ff03c0c01a5acef84aa5acdf32b445cd.exe	94
PID 5824 wrote to memory of 5276	5824	ff03c0c01a5acef84aa5acdf32b445cd.exe	94
PID 5824 wrote to memory of 5276	5824	ff03c0c01a5acef84aa5acdf32b445cd.exe	94
PID 5276 wrote to memory of 1516	5276	wn2ra4ohzdr.exe	97
PID 5276 wrote to memory of 1516	5276	wn2ra4ohzdr.exe	97
PID 5276 wrote to memory of 1516	5276	wn2ra4ohzdr.exe	97
PID 5276 wrote to memory of 1516	5276	wn2ra4ohzdr.exe	97
PID 5276 wrote to memory of 1516	5276	wn2ra4ohzdr.exe	97
PID 5276 wrote to memory of 1516	5276	wn2ra4ohzdr.exe	97
PID 5276 wrote to memory of 1516	5276	wn2ra4ohzdr.exe	97
PID 5276 wrote to memory of 1516	5276	wn2ra4ohzdr.exe	97
PID 5276 wrote to memory of 1516	5276	wn2ra4ohzdr.exe	97

C:\Users\Admin\AppData\Local\Temp\ff03c0c01a5acef84aa5acdf32b445cd.exe
"C:\Users\Admin\AppData\Local\Temp\ff03c0c01a5acef84aa5acdf32b445cd.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5824
- C:\Users\Admin\AppData\Roaming\raj4dkhhiap\wn2ra4ohzdr.exe
  "C:\Users\Admin\AppData\Roaming\raj4dkhhiap\wn2ra4ohzdr.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5276
- - C:\Users\Admin\AppData\Roaming\raj4dkhhiap\wn2ra4ohzdr.exe
    "C:\Users\Admin\AppData\Roaming\raj4dkhhiap\wn2ra4ohzdr.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    PID:1516

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\raj4dkhhiap\wn2ra4ohzdr.exe

Filesize
135KB

MD5
d66e8f8bd9ff23c7a196e41a1993026c

SHA1
fa856409e7f1a1a964dbd87cc6428694bf36e05e

SHA256
8998ecff7f7b0ae5a1576bb505105fecb5c2741c1643bb7af30440a362a6f5cb

SHA512
efa9bf16d875e477fac0b53bad74b3edc011f01bdb89f37862b6bcab4887904684c7a81c924eb5a3b362f8192d7241c4fa8c64312fa4d82414611b2426186675

Download Submit
memory/1516-24-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/1516-25-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/1516-30-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/1516-31-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/1516-27-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/1516-26-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/5276-23-0x0000000074720000-0x0000000074ED0000-memory.dmp

Filesize
7.7MB

Download
memory/5276-38-0x0000000074720000-0x0000000074ED0000-memory.dmp

Filesize
7.7MB

Download
memory/5276-34-0x0000000074720000-0x0000000074ED0000-memory.dmp

Filesize
7.7MB

Download
memory/5276-21-0x0000000074720000-0x0000000074ED0000-memory.dmp

Filesize
7.7MB

Download
memory/5824-5-0x0000000074720000-0x0000000074ED0000-memory.dmp

Filesize
7.7MB

Download
memory/5824-22-0x0000000074720000-0x0000000074ED0000-memory.dmp

Filesize
7.7MB

Download
memory/5824-20-0x000000007472E000-0x000000007472F000-memory.dmp

Filesize
4KB

Download
memory/5824-6-0x00000000052E0000-0x0000000005300000-memory.dmp

Filesize
128KB

Download
memory/5824-0-0x000000007472E000-0x000000007472F000-memory.dmp

Filesize
4KB

Download
memory/5824-4-0x0000000005000000-0x000000000500A000-memory.dmp

Filesize
40KB

Download
memory/5824-3-0x0000000004F50000-0x0000000004FE2000-memory.dmp

Filesize
584KB

Download
memory/5824-2-0x0000000005420000-0x00000000059C4000-memory.dmp

Filesize
5.6MB

Download
memory/5824-1-0x0000000000540000-0x0000000000568000-memory.dmp

Filesize
160KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads