remcos | bb39c3aa8d6c661d6c1302d0e3f02fe8758c6d5487c2c5267bd7156ce88910ce

General

Target

73a8824568c6b6f191ea6a3a6a160a50N.exe
Size

135KB
MD5

73a8824568c6b6f191ea6a3a6a160a50
SHA1

b59284719d3e49e44a366e87dee69c865c6c7d6c
SHA256

bb39c3aa8d6c661d6c1302d0e3f02fe8758c6d5487c2c5267bd7156ce88910ce
SHA512

9d48e43d2cfd88ed850b6cf1595a5deb025395bb32311b573edc5a50209abb8a592df6b28f7b707ab8fb7cf128b18714200c19b23ee9c7dc6dff482b9031f70d
SSDEEP

1536:ITHiPBX4nDzMyRXGHrc9YRHqbTypgpmb5Q+ZReSdhk/J+YLgD3mrxb53cSuYQjKs:xPd4n/M+WLcilrpgGH/GwY87mVmIXc

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

Executes dropped EXE 2 IoCs

pid	Process
2968	wn2ra4ohzdr.exe
2752	wn2ra4ohzdr.exe

Loads dropped DLL 1 IoCs

pid	Process
1512	73a8824568c6b6f191ea6a3a6a160a50N.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-1-5-21-2212144002-1172735686-1556890956-1000\Software\Microsoft\Windows\CurrentVersion\Run\raj4dkhhiap = "C:\\Users\\Admin\\AppData\\Roaming\\raj4dkhhiap\\wn2ra4ohzdr.exe"	73a8824568c6b6f191ea6a3a6a160a50N.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2968 set thread context of 2752	2968	wn2ra4ohzdr.exe	31

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	73a8824568c6b6f191ea6a3a6a160a50N.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
2752	wn2ra4ohzdr.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 1512 wrote to memory of 2968	1512	73a8824568c6b6f191ea6a3a6a160a50N.exe	30
PID 1512 wrote to memory of 2968	1512	73a8824568c6b6f191ea6a3a6a160a50N.exe	30
PID 1512 wrote to memory of 2968	1512	73a8824568c6b6f191ea6a3a6a160a50N.exe	30
PID 1512 wrote to memory of 2968	1512	73a8824568c6b6f191ea6a3a6a160a50N.exe	30
PID 2968 wrote to memory of 2752	2968	wn2ra4ohzdr.exe	31
PID 2968 wrote to memory of 2752	2968	wn2ra4ohzdr.exe	31
PID 2968 wrote to memory of 2752	2968	wn2ra4ohzdr.exe	31
PID 2968 wrote to memory of 2752	2968	wn2ra4ohzdr.exe	31
PID 2968 wrote to memory of 2752	2968	wn2ra4ohzdr.exe	31
PID 2968 wrote to memory of 2752	2968	wn2ra4ohzdr.exe	31
PID 2968 wrote to memory of 2752	2968	wn2ra4ohzdr.exe	31
PID 2968 wrote to memory of 2752	2968	wn2ra4ohzdr.exe	31
PID 2968 wrote to memory of 2752	2968	wn2ra4ohzdr.exe	31
PID 2968 wrote to memory of 2752	2968	wn2ra4ohzdr.exe	31

C:\Users\Admin\AppData\Local\Temp\73a8824568c6b6f191ea6a3a6a160a50N.exe
"C:\Users\Admin\AppData\Local\Temp\73a8824568c6b6f191ea6a3a6a160a50N.exe"
1⤵
- Loads dropped DLL
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1512
- 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:2968
- - 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:2752

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

System Information Discovery

1

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
135KB

MD5
ac1f25048d0055427ca0f2ba4b457bd3

SHA1
8d2f90228ae355ca47038b35d85b49d223dd176d

SHA256
e80535afd842e63de119ef9f49116a216aaa2d8cc9fb0fd681c6b7f42823e073

SHA512
984af955306bf664983eb04c00332890d0fc8abee85ed00f6c5e266f4b2a2e33073ab0f1d45b497a3a8e96290af232eb62984009d588fdb45bd8feafcb114971

Download Submit
memory/1512-0-0x0000000074D1E000-0x0000000074D1F000-memory.dmp

Filesize
4KB

Download
memory/1512-1-0x0000000000D20000-0x0000000000D48000-memory.dmp

Filesize
160KB

Download
memory/1512-2-0x0000000074D10000-0x00000000753FE000-memory.dmp

Filesize
6.9MB

Download
memory/1512-3-0x0000000000530000-0x0000000000550000-memory.dmp

Filesize
128KB

Download
memory/1512-12-0x0000000074D10000-0x00000000753FE000-memory.dmp

Filesize
6.9MB

Download
memory/2752-34-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/2752-18-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/2752-19-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/2752-29-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2752-28-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/2752-25-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/2752-22-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/2752-16-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/2752-35-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/2968-13-0x0000000074D10000-0x00000000753FE000-memory.dmp

Filesize
6.9MB

Download
memory/2968-15-0x0000000074D10000-0x00000000753FE000-memory.dmp

Filesize
6.9MB

Download
memory/2968-14-0x0000000000DC0000-0x0000000000DE8000-memory.dmp

Filesize
160KB

Download
memory/2968-38-0x0000000074D10000-0x00000000753FE000-memory.dmp

Filesize
6.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads