remcos | 0b7faafb8da0c827bd09a35795d30bb4a703e6ad53c5ca99cfdd1cbfd63dd55f

Analysis

max time kernel
150s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
13-01-2025 12:04

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General

Target

documents.exe
Size

488KB
MD5

bf94dfb3c600fea20a0eb3b6f2ce410f
SHA1

9be4b304813ff777c1f5aa753dabe2b4aeb07391
SHA256

0b7faafb8da0c827bd09a35795d30bb4a703e6ad53c5ca99cfdd1cbfd63dd55f
SHA512

00c72914e7344bb25b20296cb215bd3c53246eb4b55ca176ffb2a9226444d0ba992699337c76815e6a127738a8d616e466f06e2b3808e73397dc54eddf60891a
SSDEEP

6144:IuaNeIQv1dV4sXmFr7LAFIzT/72clnlePVTn0L9DEBDYTU6qynIHtc+KC:3SDQ3usXmFr70FGxlkn0LJYDiU6qyat

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-DCHPS3
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-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	documents.exe

Executes dropped EXE 1 IoCs

pid	Process
2468	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-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Rmc-DCHPS3 = "\"C:\\Users\\Admin\\AppData\\Roaming\\xenor\\yavascript.exe\""	documents.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Rmc-DCHPS3 = "\"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
2072	3580	WerFault.exe	82
4868	3580	WerFault.exe	82
3016	3580	WerFault.exe	82
4604	3580	WerFault.exe	82
2748	3580	WerFault.exe	82
3052	3580	WerFault.exe	82
2368	3580	WerFault.exe	82
648	2468	WerFault.exe	96
968	2468	WerFault.exe	96
3848	2468	WerFault.exe	96
4348	2468	WerFault.exe	96
3456	2468	WerFault.exe	96
3144	2468	WerFault.exe	96
3656	2468	WerFault.exe	96
3320	2468	WerFault.exe	96
2824	2468	WerFault.exe	96
4404	2468	WerFault.exe	96
5104	2468	WerFault.exe	96
3500	2468	WerFault.exe	96
560	2468	WerFault.exe	96
5004	2468	WerFault.exe	96
3860	2468	WerFault.exe	96
4740	2468	WerFault.exe	96
3456	2468	WerFault.exe	96
4952	2468	WerFault.exe	96
216	2468	WerFault.exe	96
3792	2468	WerFault.exe	96
4304	2468	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	documents.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	yavascript.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 3580 wrote to memory of 2468	3580	documents.exe	96
PID 3580 wrote to memory of 2468	3580	documents.exe	96
PID 3580 wrote to memory of 2468	3580	documents.exe	96

C:\Users\Admin\AppData\Local\Temp\documents.exe
"C:\Users\Admin\AppData\Local\Temp\documents.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3580
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3580 -s 932
  2⤵
  - Program crash
  PID:2072
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3580 -s 940
  2⤵
  - Program crash
  PID:4868
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3580 -s 1000
  2⤵
  - Program crash
  PID:3016
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3580 -s 1152
  2⤵
  - Program crash
  PID:4604
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3580 -s 1152
  2⤵
  - Program crash
  PID:2748
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3580 -s 1136
  2⤵
  - Program crash
  PID:3052
- 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:2468
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2468 -s 616
    3⤵
    - Program crash
    PID:648
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2468 -s 640
    3⤵
    - Program crash
    PID:968
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2468 -s 720
    3⤵
    - Program crash
    PID:3848
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2468 -s 756
    3⤵
    - Program crash
    PID:4348
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2468 -s 764
    3⤵
    - Program crash
    PID:3456
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2468 -s 928
    3⤵
    - Program crash
    PID:3144
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2468 -s 948
    3⤵
    - Program crash
    PID:3656
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2468 -s 948
    3⤵
    - Program crash
    PID:3320
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2468 -s 928
    3⤵
    - Program crash
    PID:2824
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2468 -s 1064
    3⤵
    - Program crash
    PID:4404
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2468 -s 1284
    3⤵
    - Program crash
    PID:5104
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2468 -s 772
    3⤵
    - Program crash
    PID:3500
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2468 -s 1256
    3⤵
    - Program crash
    PID:560
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2468 -s 984
    3⤵
    - Program crash
    PID:5004
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2468 -s 1424
    3⤵
    - Program crash
    PID:3860
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2468 -s 1440
    3⤵
    - Program crash
    PID:4740
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2468 -s 1432
    3⤵
    - Program crash
    PID:3456
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2468 -s 1456
    3⤵
    - Program crash
    PID:4952
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2468 -s 1468
    3⤵
    - Program crash
    PID:216
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2468 -s 1484
    3⤵
    - Program crash
    PID:3792
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2468 -s 924
    3⤵
    - Program crash
    PID:4304
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3580 -s 1312
  2⤵
  - Program crash
  PID:2368

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 3580 -ip 3580
1⤵
PID:2372

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 3580 -ip 3580
1⤵
PID:2960

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 520 -p 3580 -ip 3580
1⤵
PID:2920

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 520 -p 3580 -ip 3580
1⤵
PID:3904

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 516 -p 3580 -ip 3580
1⤵
PID:3020

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 3580 -ip 3580
1⤵
PID:3508

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 3580 -ip 3580
1⤵
PID:4508

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 2468 -ip 2468
1⤵
PID:4700

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 552 -p 2468 -ip 2468
1⤵
PID:1480

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 2468 -ip 2468
1⤵
PID:1708

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 484 -p 2468 -ip 2468
1⤵
PID:1956

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 548 -p 2468 -ip 2468
1⤵
PID:3808

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 552 -p 2468 -ip 2468
1⤵
PID:3956

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 2468 -ip 2468
1⤵
PID:3584

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 2468 -ip 2468
1⤵
PID:2820

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 2468 -ip 2468
1⤵
PID:916

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 544 -p 2468 -ip 2468
1⤵
PID:3232

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 2468 -ip 2468
1⤵
PID:1824

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 2468 -ip 2468
1⤵
PID:3920

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 516 -p 2468 -ip 2468
1⤵
PID:4508

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 364 -p 2468 -ip 2468
1⤵
PID:2000

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 552 -p 2468 -ip 2468
1⤵
PID:2428

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 544 -p 2468 -ip 2468
1⤵
PID:760

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 552 -p 2468 -ip 2468
1⤵
PID:1992

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 544 -p 2468 -ip 2468
1⤵
PID:2548

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 2468 -ip 2468
1⤵
PID:1360

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 556 -p 2468 -ip 2468
1⤵
PID:2304

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 2468 -ip 2468
1⤵
PID:5060

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
488KB

MD5
bf94dfb3c600fea20a0eb3b6f2ce410f

SHA1
9be4b304813ff777c1f5aa753dabe2b4aeb07391

SHA256
0b7faafb8da0c827bd09a35795d30bb4a703e6ad53c5ca99cfdd1cbfd63dd55f

SHA512
00c72914e7344bb25b20296cb215bd3c53246eb4b55ca176ffb2a9226444d0ba992699337c76815e6a127738a8d616e466f06e2b3808e73397dc54eddf60891a

Download Submit
memory/2468-28-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2468-30-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2468-23-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2468-35-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2468-24-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2468-34-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2468-16-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2468-25-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2468-18-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2468-20-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2468-21-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2468-22-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2468-33-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2468-32-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2468-17-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2468-26-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2468-27-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2468-31-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2468-29-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/3580-3-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/3580-1-0x0000000000760000-0x0000000000860000-memory.dmp

Filesize
1024KB

Download
memory/3580-13-0x0000000002250000-0x00000000022CA000-memory.dmp

Filesize
488KB

Download
memory/3580-2-0x0000000002250000-0x00000000022CA000-memory.dmp

Filesize
488KB

Download
memory/3580-12-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/3580-14-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads