remcos | f31693ba292189d1297f38613de12314f6c006305e1ee89a8016339c909b4d7c

General

Target

DOCUMENT_MAIL_MK77123.PDF.exe
Size

973KB
MD5

ae0d8eed18706f49d7c7a7dd9164a920
SHA1

0c939acf01c15cea6e9efd6ab8d8dc5499a7ef4f
SHA256

4cf29e8cd55272cc6677212c469cfb53464225f42c85942abceef9d7bd86aad3
SHA512

5b64c63e9918f84f89b6c5ebddd66d8ddaca92a050514c31a07c10db0232cdbf63037d5fa0d99d8f0b838e6afd2a7382094df6f8334bc5d39a2a288f2e31de54
SSDEEP

24576:YQ3AghukvVdP/tGOn0b7hvtbL67vgnEz9Z1zS:YQQRIobXL6zgEz9ZNS

Score

10^/10

remcos host discovery rat

Malware Config

Extracted

Family

remcos

Botnet

Host

C2

oyo.work.gd:3142

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
remcos.exe
copy_folder
vlc
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
false
keylog_crypt
true
keylog_file
logs.dat
keylog_flag
false
keylog_folder
pdf
mouse_option
false
mutex
jkm-I9KENP
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
ios
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
Suspicious use of SetThreadContext 1 IoCs

Processes:

DOCUMENT_MAIL_MK77123.PDF.exe

description pid process target process

PID 5008 set thread context of 3256 5008 DOCUMENT_MAIL_MK77123.PDF.exe DOCUMENT_MAIL_MK77123.PDF.exe

description	pid	process	target process
PID 5008 set thread context of 3256	5008	DOCUMENT_MAIL_MK77123.PDF.exe	DOCUMENT_MAIL_MK77123.PDF.exe

System Location Discovery: System Language Discovery 1 TTPs 2 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

Processes:

DOCUMENT_MAIL_MK77123.PDF.exeDOCUMENT_MAIL_MK77123.PDF.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	DOCUMENT_MAIL_MK77123.PDF.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	DOCUMENT_MAIL_MK77123.PDF.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

DOCUMENT_MAIL_MK77123.PDF.exe

pid process

3256 DOCUMENT_MAIL_MK77123.PDF.exe

pid	process
3256	DOCUMENT_MAIL_MK77123.PDF.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

DOCUMENT_MAIL_MK77123.PDF.exe

description	pid	process	target process
PID 5008 wrote to memory of 3256	5008	DOCUMENT_MAIL_MK77123.PDF.exe	DOCUMENT_MAIL_MK77123.PDF.exe
PID 5008 wrote to memory of 3256	5008	DOCUMENT_MAIL_MK77123.PDF.exe	DOCUMENT_MAIL_MK77123.PDF.exe
PID 5008 wrote to memory of 3256	5008	DOCUMENT_MAIL_MK77123.PDF.exe	DOCUMENT_MAIL_MK77123.PDF.exe
PID 5008 wrote to memory of 3256	5008	DOCUMENT_MAIL_MK77123.PDF.exe	DOCUMENT_MAIL_MK77123.PDF.exe
PID 5008 wrote to memory of 3256	5008	DOCUMENT_MAIL_MK77123.PDF.exe	DOCUMENT_MAIL_MK77123.PDF.exe
PID 5008 wrote to memory of 3256	5008	DOCUMENT_MAIL_MK77123.PDF.exe	DOCUMENT_MAIL_MK77123.PDF.exe
PID 5008 wrote to memory of 3256	5008	DOCUMENT_MAIL_MK77123.PDF.exe	DOCUMENT_MAIL_MK77123.PDF.exe
PID 5008 wrote to memory of 3256	5008	DOCUMENT_MAIL_MK77123.PDF.exe	DOCUMENT_MAIL_MK77123.PDF.exe
PID 5008 wrote to memory of 3256	5008	DOCUMENT_MAIL_MK77123.PDF.exe	DOCUMENT_MAIL_MK77123.PDF.exe
PID 5008 wrote to memory of 3256	5008	DOCUMENT_MAIL_MK77123.PDF.exe	DOCUMENT_MAIL_MK77123.PDF.exe
PID 5008 wrote to memory of 3256	5008	DOCUMENT_MAIL_MK77123.PDF.exe	DOCUMENT_MAIL_MK77123.PDF.exe
PID 5008 wrote to memory of 3256	5008	DOCUMENT_MAIL_MK77123.PDF.exe	DOCUMENT_MAIL_MK77123.PDF.exe

C:\Users\Admin\AppData\Local\Temp\DOCUMENT_MAIL_MK77123.PDF.exe
"C:\Users\Admin\AppData\Local\Temp\DOCUMENT_MAIL_MK77123.PDF.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5008
- C:\Users\Admin\AppData\Local\Temp\DOCUMENT_MAIL_MK77123.PDF.exe
  "C:\Users\Admin\AppData\Local\Temp\DOCUMENT_MAIL_MK77123.PDF.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  PID:3256

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\ProgramData\pdf\logs.dat

Filesize
144B

MD5
ec554ba50b544dc9abf677411f0b91a7

SHA1
497db8d5094e972e0609c013e66b597e9014729e

SHA256
5ddaa1d64a27416f27847531892e42832eabd7a08d8a43bd8e5212ecb86bdadd

SHA512
b3ab48f9c6cd03bbd1499d09ce6f12fada32b6f581abffedf2a744c9b9706cdb31c668997453821922c7642e697c1b742827babae7748421274866cd34042a64

Download Submit
memory/3256-24-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/3256-29-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/3256-18-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/3256-50-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/3256-15-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/3256-42-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/3256-43-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/3256-35-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/3256-34-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/3256-21-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/3256-11-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/3256-26-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/3256-14-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/3256-19-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/3256-23-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/3256-22-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/3256-12-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/5008-9-0x0000000074620000-0x0000000074DD0000-memory.dmp

Filesize
7.7MB

Download
memory/5008-5-0x0000000005800000-0x000000000580A000-memory.dmp

Filesize
40KB

Download
memory/5008-3-0x0000000005740000-0x00000000057D2000-memory.dmp

Filesize
584KB

Download
memory/5008-0-0x000000007462E000-0x000000007462F000-memory.dmp

Filesize
4KB

Download
memory/5008-20-0x0000000074620000-0x0000000074DD0000-memory.dmp

Filesize
7.7MB

Download
memory/5008-10-0x0000000007260000-0x0000000007320000-memory.dmp

Filesize
768KB

Download
memory/5008-1-0x0000000000C60000-0x0000000000D58000-memory.dmp

Filesize
992KB

Download
memory/5008-2-0x0000000005DB0000-0x0000000006354000-memory.dmp

Filesize
5.6MB

Download
memory/5008-8-0x00000000058C0000-0x00000000058D2000-memory.dmp

Filesize
72KB

Download
memory/5008-7-0x000000007462E000-0x000000007462F000-memory.dmp

Filesize
4KB

Download
memory/5008-6-0x00000000059F0000-0x0000000005A8C000-memory.dmp

Filesize
624KB

Download
memory/5008-4-0x0000000074620000-0x0000000074DD0000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing