remcos | f31693ba292189d1297f38613de12314f6c006305e1ee89a8016339c909b4d7c

Analysis

max time kernel
297s
max time network
277s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
20-11-2024 17:24

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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

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

description	pid	Process	procid_target
PID 5004 set thread context of 860	5004	DOCUMENT_MAIL_MK77123.PDF.exe	100

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

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 behavior: EnumeratesProcesses 4 IoCs

pid	Process
5004	DOCUMENT_MAIL_MK77123.PDF.exe
5004	DOCUMENT_MAIL_MK77123.PDF.exe
5004	DOCUMENT_MAIL_MK77123.PDF.exe
5004	DOCUMENT_MAIL_MK77123.PDF.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	5004	DOCUMENT_MAIL_MK77123.PDF.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
860	DOCUMENT_MAIL_MK77123.PDF.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 5004 wrote to memory of 636	5004	DOCUMENT_MAIL_MK77123.PDF.exe	98
PID 5004 wrote to memory of 636	5004	DOCUMENT_MAIL_MK77123.PDF.exe	98
PID 5004 wrote to memory of 636	5004	DOCUMENT_MAIL_MK77123.PDF.exe	98
PID 5004 wrote to memory of 1908	5004	DOCUMENT_MAIL_MK77123.PDF.exe	99
PID 5004 wrote to memory of 1908	5004	DOCUMENT_MAIL_MK77123.PDF.exe	99
PID 5004 wrote to memory of 1908	5004	DOCUMENT_MAIL_MK77123.PDF.exe	99
PID 5004 wrote to memory of 860	5004	DOCUMENT_MAIL_MK77123.PDF.exe	100
PID 5004 wrote to memory of 860	5004	DOCUMENT_MAIL_MK77123.PDF.exe	100
PID 5004 wrote to memory of 860	5004	DOCUMENT_MAIL_MK77123.PDF.exe	100
PID 5004 wrote to memory of 860	5004	DOCUMENT_MAIL_MK77123.PDF.exe	100
PID 5004 wrote to memory of 860	5004	DOCUMENT_MAIL_MK77123.PDF.exe	100
PID 5004 wrote to memory of 860	5004	DOCUMENT_MAIL_MK77123.PDF.exe	100
PID 5004 wrote to memory of 860	5004	DOCUMENT_MAIL_MK77123.PDF.exe	100
PID 5004 wrote to memory of 860	5004	DOCUMENT_MAIL_MK77123.PDF.exe	100
PID 5004 wrote to memory of 860	5004	DOCUMENT_MAIL_MK77123.PDF.exe	100
PID 5004 wrote to memory of 860	5004	DOCUMENT_MAIL_MK77123.PDF.exe	100
PID 5004 wrote to memory of 860	5004	DOCUMENT_MAIL_MK77123.PDF.exe	100
PID 5004 wrote to memory of 860	5004	DOCUMENT_MAIL_MK77123.PDF.exe	100

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 behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5004
- C:\Users\Admin\AppData\Local\Temp\DOCUMENT_MAIL_MK77123.PDF.exe
  "C:\Users\Admin\AppData\Local\Temp\DOCUMENT_MAIL_MK77123.PDF.exe"
  2⤵
  PID:636
- C:\Users\Admin\AppData\Local\Temp\DOCUMENT_MAIL_MK77123.PDF.exe
  "C:\Users\Admin\AppData\Local\Temp\DOCUMENT_MAIL_MK77123.PDF.exe"
  2⤵
  PID:1908
- 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:860

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\pdf\logs.dat

Filesize
144B

MD5
a58b2b16f7fa476986de1a013afdb320

SHA1
a9bce4626d51f5d71442b8171c20ab8ff494ccae

SHA256
8902a9bd5a2bec40740f8b13ed0dc609a7b5414fd78101b2eebe3b630ef7f503

SHA512
eccd03044cb8777caef82489692ba9c25afa7223ce227669d6c762ef3ab9e000827f21a7d0781c8b6ea26ef81c27cf6c8e6b150e2e6fe62627c1e00bafeea5f8

Download Submit
memory/860-12-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-82-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-18-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-19-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-75-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-74-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-66-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-67-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-59-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-58-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-11-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-43-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-42-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-90-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-83-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-15-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-20-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-50-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-23-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-22-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-24-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-29-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-91-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-34-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-35-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/860-14-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/5004-9-0x0000000075000000-0x00000000757B0000-memory.dmp

Filesize
7.7MB

Download
memory/5004-21-0x0000000075000000-0x00000000757B0000-memory.dmp

Filesize
7.7MB

Download
memory/5004-10-0x0000000006550000-0x0000000006610000-memory.dmp

Filesize
768KB

Download
memory/5004-0-0x000000007500E000-0x000000007500F000-memory.dmp

Filesize
4KB

Download
memory/5004-8-0x00000000054C0000-0x00000000054D2000-memory.dmp

Filesize
72KB

Download
memory/5004-7-0x000000007500E000-0x000000007500F000-memory.dmp

Filesize
4KB

Download
memory/5004-4-0x00000000050D0000-0x00000000050DA000-memory.dmp

Filesize
40KB

Download
memory/5004-5-0x0000000005290000-0x000000000532C000-memory.dmp

Filesize
624KB

Download
memory/5004-6-0x0000000075000000-0x00000000757B0000-memory.dmp

Filesize
7.7MB

Download
memory/5004-3-0x0000000005030000-0x00000000050C2000-memory.dmp

Filesize
584KB

Download
memory/5004-2-0x00000000055E0000-0x0000000005B84000-memory.dmp

Filesize
5.6MB

Download
memory/5004-1-0x0000000000520000-0x0000000000618000-memory.dmp

Filesize
992KB

Download