remcos | 4e8b3c07043d58d62d456ddb7201ad7b14578df119f005a8b441885b8208114b

General

Target

main.pdf.pif.exe
Size

492KB
MD5

5ae083acb92a7e6dfe29b4edb7ec20fb
SHA1

c12a45b9cf33a1881c34e0e3d469e7d039130426
SHA256

7390d25410ff7cf2690c1d340f46578881687443fd3653283cf3818769bbb848
SHA512

75b23e5f3a1fb90424932a211cbdac7c8c3c078a57d8d6754e15d9bdaa4cd7b58ff91abb36a20639597a149b2aa8a1a4feec75a31233afb02a7e4d303f497f5b
SSDEEP

3072:kMSncRzAOP4g5IdrO79+lHNNqqRPsO98bx0NO4lzv:XSncRlPbI1O7kNPRPp98V0xl

Score

10^/10

remcos host discovery persistence rat

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

Host

C2

192.168.168.154:5555

Attributes

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

Executes dropped EXE 1 IoCs

pid	Process
2888	BACKDOOR.EXE

Loads dropped DLL 2 IoCs

pid	Process
2796	main.pdf.pif.exe
2796	main.pdf.pif.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-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	BACKDOOR.EXE

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 5 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	main.pdf.pif.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	BACKDOOR.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AcroRd32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
1412	PING.EXE

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1412	PING.EXE

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
3048	AcroRd32.exe
3048	AcroRd32.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 2796 wrote to memory of 2888	2796	main.pdf.pif.exe	30
PID 2796 wrote to memory of 2888	2796	main.pdf.pif.exe	30
PID 2796 wrote to memory of 2888	2796	main.pdf.pif.exe	30
PID 2796 wrote to memory of 2888	2796	main.pdf.pif.exe	30
PID 2796 wrote to memory of 3048	2796	main.pdf.pif.exe	31
PID 2796 wrote to memory of 3048	2796	main.pdf.pif.exe	31
PID 2796 wrote to memory of 3048	2796	main.pdf.pif.exe	31
PID 2796 wrote to memory of 3048	2796	main.pdf.pif.exe	31
PID 2888 wrote to memory of 2708	2888	BACKDOOR.EXE	32
PID 2888 wrote to memory of 2708	2888	BACKDOOR.EXE	32
PID 2888 wrote to memory of 2708	2888	BACKDOOR.EXE	32
PID 2888 wrote to memory of 2708	2888	BACKDOOR.EXE	32
PID 2888 wrote to memory of 2708	2888	BACKDOOR.EXE	32
PID 2888 wrote to memory of 2708	2888	BACKDOOR.EXE	32
PID 2888 wrote to memory of 2708	2888	BACKDOOR.EXE	32
PID 2708 wrote to memory of 1412	2708	cmd.exe	34
PID 2708 wrote to memory of 1412	2708	cmd.exe	34
PID 2708 wrote to memory of 1412	2708	cmd.exe	34
PID 2708 wrote to memory of 1412	2708	cmd.exe	34

C:\Users\Admin\AppData\Local\Temp\main.pdf.pif.exe
"C:\Users\Admin\AppData\Local\Temp\main.pdf.pif.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2796
- C:\Users\Admin\AppData\Local\Temp\BACKDOOR.EXE
  "C:\Users\Admin\AppData\Local\Temp\BACKDOOR.EXE"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2888
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\install.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2708
  - - C:\Windows\SysWOW64\PING.EXE
      PING 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:1412
  - - C:\Users\Admin\AppData\Roaming\remcos\remcos.exe
      "C:\Users\Admin\AppData\Roaming\remcos\remcos.exe"
      4⤵
      PID:1236
- C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe
  "C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe" "C:\Users\Admin\AppData\Local\Temp\PDF.PDF"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:3048

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

Remote System Discovery

1

T1018

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\install.bat

Filesize
99B

MD5
76c1687d97dfdbcea62ef1490bec5001

SHA1
5f4d1aeafa7d840cde67b76f97416dd68efd1bed

SHA256
79f04ea049979ffd2232c459fdd57fae97a5255aea9b4a2c7dce7ead856f37a4

SHA512
da250f0628632a644f159d818a82a8b9cca8224e46843bddbe0f6f9c32a2d04f7736a620af49ab6d77616317ca7d68285e60043965fe86c03d940835bd30a925

Download Submit
\Users\Admin\AppData\Local\Temp\BACKDOOR.EXE

Filesize
36KB

MD5
cffddc7c3177706625765eb684410c7d

SHA1
04d82ea5e2b0e8e06a3284715146e11148209d2d

SHA256
39ecab5ce3b3d2049f707937f679015daf7b3bb56a313cf44683d75887511166

SHA512
2165e1553c40291f49823e7fac5454d137f1d2170e54c1e237afe62f2fc43361db8dadd4c1bed5c61aed8c4ee4c9a405685f7620f5f25efada7bc33957cb2765

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memory/2796-4-0x0000000000340000-0x0000000000359000-memory.dmp

Filesize
100KB

Download
memory/2796-10-0x0000000000340000-0x0000000000359000-memory.dmp

Filesize
100KB

Download
memory/2888-12-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

Download
memory/2888-24-0x0000000000400000-0x0000000000419000-memory.dmp

Filesize
100KB

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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