remcos | 8fb0916a58f9b1d17d00504e4ff24d8a8ce8915d1c9dcb58a6b2d818fdb3967e

General

Target

msimg32.dll
Size

1.4MB
MD5

4b0892a87745e1cbb805f4893d844ff3
SHA1

9dbb4560de72f2a449db595c0ff28b22b320ecfd
SHA256

947ba630b4d2d998525eff4f08a5f9a0f45052b51fab71c7838ffae57ab0e4f5
SHA512

a92aa599592714f42e884928c8afd6f88e83c7c13d9330d4a1da70c35f1d85a95ead965158006adca2caec11d8c6922e70004f8531f0547776aa1f28fbda1e3c
SSDEEP

24576:WacJJPFJ/ti1GJQva0cceV+Atxdl8HCb7PiZ6vvYIerK67eBiDw0ueAwwSg3D6d0:W9JJPFJ/ti1GJQva0cceV+Atxdl8HCbd

Score

10^/10

remcos remotehost discovery persistence rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

privmerkt.com:6042

Attributes

audio_folder
MicRecords
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
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-RIFKGX
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
take_screenshot_option
false
take_screenshot_time
5

Signatures

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

Blocklisted process makes network request 2 IoCs

flow	pid	Process
20	404	rundll32.exe
24	404	rundll32.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-1-5-21-656926755-4116854191-210765258-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\*UpdaterCisco = "rundll32.exe C:\\Users\\Admin\\Documents\\CiscoUpdater.dll,EntryPoint"	reg.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
3244	rundll32.exe

System Location Discovery: System Language Discovery 1 TTPs 4 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	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3220 wrote to memory of 3244	3220	rundll32.exe	84
PID 3220 wrote to memory of 3244	3220	rundll32.exe	84
PID 3220 wrote to memory of 3244	3220	rundll32.exe	84
PID 3244 wrote to memory of 404	3244	rundll32.exe	92
PID 3244 wrote to memory of 404	3244	rundll32.exe	92
PID 3244 wrote to memory of 404	3244	rundll32.exe	92
PID 3244 wrote to memory of 404	3244	rundll32.exe	92
PID 3244 wrote to memory of 404	3244	rundll32.exe	92
PID 3244 wrote to memory of 404	3244	rundll32.exe	92
PID 3244 wrote to memory of 620	3244	rundll32.exe	93
PID 3244 wrote to memory of 620	3244	rundll32.exe	93
PID 3244 wrote to memory of 620	3244	rundll32.exe	93
PID 620 wrote to memory of 116	620	cmd.exe	95
PID 620 wrote to memory of 116	620	cmd.exe	95
PID 620 wrote to memory of 116	620	cmd.exe	95

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\msimg32.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:3220
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\msimg32.dll,#1
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3244
- - C:\Windows\SysWOW64\rundll32.exe
    "C:\Windows\SysWOW64\rundll32.exe"
    3⤵
    - Blocklisted process makes network request
    - System Location Discovery: System Language Discovery
    PID:404
- - C:\Windows\SysWOW64\cmd.exe
    cmd.exe /C reg add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "*UpdaterCisco" /t REG_SZ /d "rundll32.exe C:\Users\Admin\Documents\CiscoUpdater.dll",EntryPoint /f & exit
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:620
  - - C:\Windows\SysWOW64\reg.exe
      reg add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "*UpdaterCisco" /t REG_SZ /d "rundll32.exe C:\Users\Admin\Documents\CiscoUpdater.dll",EntryPoint /f
      4⤵
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      PID:116

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 Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/404-19-0x0000000000460000-0x00000000004E2000-memory.dmp

Filesize
520KB

Download
memory/404-24-0x0000000000460000-0x00000000004E2000-memory.dmp

Filesize
520KB

Download
memory/404-14-0x0000000000460000-0x00000000004E2000-memory.dmp

Filesize
520KB

Download
memory/404-5-0x00000000004F0000-0x00000000004F1000-memory.dmp

Filesize
4KB

Download
memory/404-9-0x0000000000460000-0x00000000004E2000-memory.dmp

Filesize
520KB

Download
memory/404-11-0x0000000000460000-0x00000000004E2000-memory.dmp

Filesize
520KB

Download
memory/404-26-0x0000000000460000-0x00000000004E2000-memory.dmp

Filesize
520KB

Download
memory/404-21-0x0000000000460000-0x00000000004E2000-memory.dmp

Filesize
520KB

Download
memory/404-23-0x0000000000460000-0x00000000004E2000-memory.dmp

Filesize
520KB

Download
memory/404-15-0x0000000000460000-0x00000000004E2000-memory.dmp

Filesize
520KB

Download
memory/404-22-0x0000000000460000-0x00000000004E2000-memory.dmp

Filesize
520KB

Download
memory/404-27-0x0000000000460000-0x00000000004E2000-memory.dmp

Filesize
520KB

Download
memory/404-12-0x0000000000460000-0x00000000004E2000-memory.dmp

Filesize
520KB

Download
memory/404-16-0x0000000000460000-0x00000000004E2000-memory.dmp

Filesize
520KB

Download
memory/404-17-0x0000000000460000-0x00000000004E2000-memory.dmp

Filesize
520KB

Download
memory/3244-10-0x0000000010000000-0x0000000010160000-memory.dmp

Filesize
1.4MB

Download
memory/3244-20-0x0000000010019000-0x0000000010033000-memory.dmp

Filesize
104KB

Download
memory/3244-1-0x0000000010019000-0x0000000010033000-memory.dmp

Filesize
104KB

Download
memory/3244-8-0x0000000010000000-0x0000000010160000-memory.dmp

Filesize
1.4MB

Download
memory/3244-3-0x0000000010000000-0x0000000010160000-memory.dmp

Filesize
1.4MB

Download
memory/3244-4-0x0000000010000000-0x0000000010160000-memory.dmp

Filesize
1.4MB

Download
memory/3244-0-0x0000000010000000-0x0000000010160000-memory.dmp

Filesize
1.4MB

Download
memory/3244-2-0x0000000010000000-0x0000000010160000-memory.dmp

Filesize
1.4MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads