remcos | ab1863097df61e6f421971762e3dbc8773fc3cf6dc62e120ce4e105270fd5d3c

General

Target

f106558563ef13a879cc15f3625fbfe0N.exe
Size

140KB
MD5

f106558563ef13a879cc15f3625fbfe0
SHA1

e45a0531db955a1dd1befcf0a9f849c82704bdbe
SHA256

ab1863097df61e6f421971762e3dbc8773fc3cf6dc62e120ce4e105270fd5d3c
SHA512

1c67e65078e237b61b4ef720d28c2227849b469d849670b1f10f03d49b28c0c9f5734a3adba498a54efc22e11811075af5b6577a1f2770901d1ba8ad05dce114
SSDEEP

3072:xPd4n/M+WLcilrpgGH/GwY87mVmIXhIHb+a:xP6/M+WLckOBhVmI0+a

Score

10^/10

remcos host discovery persistence rat

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

Host

C2

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

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-1-5-21-786284298-625481688-3210388970-1000\Control Panel\International\Geo\Nation	f106558563ef13a879cc15f3625fbfe0N.exe

Executes dropped EXE 2 IoCs

pid	Process
768	wn2ra4ohzdr.exe
4872	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-1-5-21-786284298-625481688-3210388970-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\raj4dkhhiap = "C:\\Users\\Admin\\AppData\\Roaming\\raj4dkhhiap\\wn2ra4ohzdr.exe"	f106558563ef13a879cc15f3625fbfe0N.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 768 set thread context of 4872	768	wn2ra4ohzdr.exe	95

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	f106558563ef13a879cc15f3625fbfe0N.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
4872	wn2ra4ohzdr.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 4484 wrote to memory of 768	4484	f106558563ef13a879cc15f3625fbfe0N.exe	92
PID 4484 wrote to memory of 768	4484	f106558563ef13a879cc15f3625fbfe0N.exe	92
PID 4484 wrote to memory of 768	4484	f106558563ef13a879cc15f3625fbfe0N.exe	92
PID 768 wrote to memory of 4872	768	wn2ra4ohzdr.exe	95
PID 768 wrote to memory of 4872	768	wn2ra4ohzdr.exe	95
PID 768 wrote to memory of 4872	768	wn2ra4ohzdr.exe	95
PID 768 wrote to memory of 4872	768	wn2ra4ohzdr.exe	95
PID 768 wrote to memory of 4872	768	wn2ra4ohzdr.exe	95
PID 768 wrote to memory of 4872	768	wn2ra4ohzdr.exe	95
PID 768 wrote to memory of 4872	768	wn2ra4ohzdr.exe	95
PID 768 wrote to memory of 4872	768	wn2ra4ohzdr.exe	95
PID 768 wrote to memory of 4872	768	wn2ra4ohzdr.exe	95

C:\Users\Admin\AppData\Local\Temp\f106558563ef13a879cc15f3625fbfe0N.exe
"C:\Users\Admin\AppData\Local\Temp\f106558563ef13a879cc15f3625fbfe0N.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4484
- 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:768
- - 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:4872

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
140KB

MD5
a64819a0011d8f34909d2c9c41839611

SHA1
d758b1bcf0a0a0df9e49cd2880271b7f3b4ef703

SHA256
083163406513464dc9db85ae59d1c54fff8d21bd635fdbcd9004c7e089d51497

SHA512
aa12edc6761a3dbe85b6cecc837ee57789f5457d9dbce8a4b1afa63fe151b68a2c14b169ae8a340b9274f15c3c24e0607ef0db0f241d891451bab4530c0182b8

Download Submit
memory/768-36-0x0000000074A30000-0x00000000751E0000-memory.dmp

Filesize
7.7MB

Download
memory/768-34-0x0000000074A30000-0x00000000751E0000-memory.dmp

Filesize
7.7MB

Download
memory/768-23-0x0000000074A30000-0x00000000751E0000-memory.dmp

Filesize
7.7MB

Download
memory/768-21-0x0000000074A30000-0x00000000751E0000-memory.dmp

Filesize
7.7MB

Download
memory/4484-22-0x0000000074A30000-0x00000000751E0000-memory.dmp

Filesize
7.7MB

Download
memory/4484-2-0x0000000005D50000-0x00000000062F4000-memory.dmp

Filesize
5.6MB

Download
memory/4484-5-0x0000000005890000-0x000000000589A000-memory.dmp

Filesize
40KB

Download
memory/4484-20-0x0000000074A3E000-0x0000000074A3F000-memory.dmp

Filesize
4KB

Download
memory/4484-4-0x0000000074A30000-0x00000000751E0000-memory.dmp

Filesize
7.7MB

Download
memory/4484-0-0x0000000074A3E000-0x0000000074A3F000-memory.dmp

Filesize
4KB

Download
memory/4484-3-0x00000000056C0000-0x0000000005752000-memory.dmp

Filesize
584KB

Download
memory/4484-6-0x0000000005970000-0x0000000005990000-memory.dmp

Filesize
128KB

Download
memory/4484-1-0x0000000000E00000-0x0000000000E28000-memory.dmp

Filesize
160KB

Download
memory/4872-27-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/4872-24-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/4872-30-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/4872-31-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/4872-26-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/4872-25-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads