remcos | 0e184edac45ddeaf7ca4681b65e7b4accafb6705032faf6d2f6a61d2ef6d1ded

Analysis

max time kernel
150s
max time network
145s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
14-12-2024 12:44

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General

Target

requests-pdf.exe
Size

474KB
MD5

36c9bb380d71f7ad243b57c522fc2768
SHA1

ef2eb660d985bfb693fcdb5b81c3ccffb9763646
SHA256

0e184edac45ddeaf7ca4681b65e7b4accafb6705032faf6d2f6a61d2ef6d1ded
SHA512

e28112d772dbacfae29de2b6b866f51ecad05278c2dc2a87bc73c6817a0c5db8310bea2de7b22a05a69a529858bdc5eae0537f9ec4238e9d8bc7e37e84678e0f
SSDEEP

6144:w5C+1+ZjpLnXIc5qM2ssBvQvSDfMe9v5lxtJQwNbG1Aflpw4CWffeM:w5C+I5JnYSidt3DPNbG1ENCWZ

Score

10^/10

remcos yavakosa discovery persistence rat

Malware Config

Extracted

Family

remcos

Botnet

Yavakosa

198.23.227.212:32583

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
yavascript.exe
copy_folder
xenor
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
mouse_option
false
mutex
Rmc-I7G983
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
Remcos family
remcos

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	requests-pdf.exe

Executes dropped EXE 1 IoCs

pid	Process
944	yavascript.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Rmc-I7G983 = "\"C:\\Users\\Admin\\AppData\\Roaming\\xenor\\yavascript.exe\""	requests-pdf.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Rmc-I7G983 = "\"C:\\Users\\Admin\\AppData\\Roaming\\xenor\\yavascript.exe\""	yavascript.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Program crash 28 IoCs

pid	pid_target	Process	procid_target
4528	2572	WerFault.exe	82
704	2572	WerFault.exe	82
348	2572	WerFault.exe	82
1716	2572	WerFault.exe	82
5116	2572	WerFault.exe	82
2320	2572	WerFault.exe	82
3868	2572	WerFault.exe	82
220	944	WerFault.exe	96
4192	944	WerFault.exe	96
4160	944	WerFault.exe	96
3772	944	WerFault.exe	96
1556	944	WerFault.exe	96
1800	944	WerFault.exe	96
2508	944	WerFault.exe	96
3592	944	WerFault.exe	96
2268	944	WerFault.exe	96
5044	944	WerFault.exe	96
1868	944	WerFault.exe	96
3160	944	WerFault.exe	96
2028	944	WerFault.exe	96
3752	944	WerFault.exe	96
3712	944	WerFault.exe	96
4600	944	WerFault.exe	96
4928	944	WerFault.exe	96
1812	944	WerFault.exe	96
4548	944	WerFault.exe	96
4920	944	WerFault.exe	96
1516	944	WerFault.exe	96

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	requests-pdf.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	yavascript.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2572 wrote to memory of 944	2572	requests-pdf.exe	96
PID 2572 wrote to memory of 944	2572	requests-pdf.exe	96
PID 2572 wrote to memory of 944	2572	requests-pdf.exe	96

C:\Users\Admin\AppData\Local\Temp\requests-pdf.exe
"C:\Users\Admin\AppData\Local\Temp\requests-pdf.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2572
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2572 -s 948
  2⤵
  - Program crash
  PID:4528
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2572 -s 952
  2⤵
  - Program crash
  PID:704
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2572 -s 1128
  2⤵
  - Program crash
  PID:348
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2572 -s 980
  2⤵
  - Program crash
  PID:1716
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2572 -s 1128
  2⤵
  - Program crash
  PID:5116
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2572 -s 1140
  2⤵
  - Program crash
  PID:2320
- C:\Users\Admin\AppData\Roaming\xenor\yavascript.exe
  "C:\Users\Admin\AppData\Roaming\xenor\yavascript.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  PID:944
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 944 -s 616
    3⤵
    - Program crash
    PID:220
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 944 -s 644
    3⤵
    - Program crash
    PID:4192
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 944 -s 720
    3⤵
    - Program crash
    PID:4160
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 944 -s 756
    3⤵
    - Program crash
    PID:3772
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 944 -s 728
    3⤵
    - Program crash
    PID:1556
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 944 -s 928
    3⤵
    - Program crash
    PID:1800
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 944 -s 948
    3⤵
    - Program crash
    PID:2508
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 944 -s 968
    3⤵
    - Program crash
    PID:3592
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 944 -s 976
    3⤵
    - Program crash
    PID:2268
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 944 -s 1064
    3⤵
    - Program crash
    PID:5044
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 944 -s 1252
    3⤵
    - Program crash
    PID:1868
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 944 -s 760
    3⤵
    - Program crash
    PID:3160
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 944 -s 864
    3⤵
    - Program crash
    PID:2028
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 944 -s 1440
    3⤵
    - Program crash
    PID:3752
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 944 -s 1392
    3⤵
    - Program crash
    PID:3712
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 944 -s 928
    3⤵
    - Program crash
    PID:4600
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 944 -s 1172
    3⤵
    - Program crash
    PID:4928
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 944 -s 864
    3⤵
    - Program crash
    PID:1812
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 944 -s 928
    3⤵
    - Program crash
    PID:4548
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 944 -s 1420
    3⤵
    - Program crash
    PID:4920
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 944 -s 924
    3⤵
    - Program crash
    PID:1516
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2572 -s 960
  2⤵
  - Program crash
  PID:3868

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 2572 -ip 2572
1⤵
PID:3648

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 2572 -ip 2572
1⤵
PID:868

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 368 -p 2572 -ip 2572
1⤵
PID:5016

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 2572 -ip 2572
1⤵
PID:1536

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 512 -p 2572 -ip 2572
1⤵
PID:1680

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 2572 -ip 2572
1⤵
PID:3296

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 2572 -ip 2572
1⤵
PID:1900

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 944 -ip 944
1⤵
PID:2716

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 368 -p 944 -ip 944
1⤵
PID:4628

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 944 -ip 944
1⤵
PID:3460

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 944 -ip 944
1⤵
PID:3196

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 944 -ip 944
1⤵
PID:1752

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 944 -ip 944
1⤵
PID:1356

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 516 -p 944 -ip 944
1⤵
PID:1248

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 512 -p 944 -ip 944
1⤵
PID:4260

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 944 -ip 944
1⤵
PID:3208

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 944 -ip 944
1⤵
PID:4692

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 944 -ip 944
1⤵
PID:972

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 944 -ip 944
1⤵
PID:4384

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 944 -ip 944
1⤵
PID:5016

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 944 -ip 944
1⤵
PID:1536

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 512 -p 944 -ip 944
1⤵
PID:2240

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 944 -ip 944
1⤵
PID:4628

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 944 -ip 944
1⤵
PID:1356

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 944 -ip 944
1⤵
PID:4448

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 368 -p 944 -ip 944
1⤵
PID:3232

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 944 -ip 944
1⤵
PID:4384

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 944 -ip 944
1⤵
PID:4800

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\xenor\yavascript.exe

Filesize
474KB

MD5
36c9bb380d71f7ad243b57c522fc2768

SHA1
ef2eb660d985bfb693fcdb5b81c3ccffb9763646

SHA256
0e184edac45ddeaf7ca4681b65e7b4accafb6705032faf6d2f6a61d2ef6d1ded

SHA512
e28112d772dbacfae29de2b6b866f51ecad05278c2dc2a87bc73c6817a0c5db8310bea2de7b22a05a69a529858bdc5eae0537f9ec4238e9d8bc7e37e84678e0f

Download Submit
memory/944-28-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/944-32-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/944-21-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/944-33-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/944-22-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/944-31-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/944-16-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/944-17-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/944-19-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/944-20-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/944-34-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/944-30-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/944-25-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/944-24-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/944-23-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/944-26-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/944-27-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/944-29-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/2572-1-0x0000000000B90000-0x0000000000C90000-memory.dmp

Filesize
1024KB

Download
memory/2572-3-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2572-12-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/2572-13-0x0000000000AF0000-0x0000000000B6A000-memory.dmp

Filesize
488KB

Download
memory/2572-14-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2572-2-0x0000000000AF0000-0x0000000000B6A000-memory.dmp

Filesize
488KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads