remcos | 8038ff6a41673eb151cdb7f03872c741dc762834c856d70030cd54af744e36a4

Analysis

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

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
11-11-2024 07:59

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General

Target

advancePayment-pdf.exe
Size

537KB
MD5

821cd5ef8d94deeeee5b7cb82379c212
SHA1

977f8407a7033b20b96fec686e918c177160ae92
SHA256

8038ff6a41673eb151cdb7f03872c741dc762834c856d70030cd54af744e36a4
SHA512

0f4f856cf1cc965a5be602503eb3f26cee460c5b2ce709ed2f7672973da801a4cc9bd7a67f9b2ffe7471421b67d44a51c302ff98bd065febbf1d73ebe54a9881
SSDEEP

12288:kEaf/xmwKOsmya7IQVPl55z0AdmSg4MXu3KYPH:kEafZ7HyaEQVFz0AdmSg4ku3KYP

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-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	advancePayment-pdf.exe

Executes dropped EXE 1 IoCs

pid	Process
2500	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-1-5-21-2045521122-590294423-3465680274-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Rmc-I7G983 = "\"C:\\Users\\Admin\\AppData\\Roaming\\xenor\\yavascript.exe\""	advancePayment-pdf.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\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
4136	4020	WerFault.exe	82
4208	4020	WerFault.exe	82
4496	4020	WerFault.exe	82
2544	4020	WerFault.exe	82
4684	4020	WerFault.exe	82
2176	4020	WerFault.exe	82
3452	4020	WerFault.exe	82
232	2500	WerFault.exe	102
2992	2500	WerFault.exe	102
2172	2500	WerFault.exe	102
3404	2500	WerFault.exe	102
2684	2500	WerFault.exe	102
4708	2500	WerFault.exe	102
3028	2500	WerFault.exe	102
2360	2500	WerFault.exe	102
3928	2500	WerFault.exe	102
2796	2500	WerFault.exe	102
1936	2500	WerFault.exe	102
5008	2500	WerFault.exe	102
1984	2500	WerFault.exe	102
3272	2500	WerFault.exe	102
3364	2500	WerFault.exe	102
952	2500	WerFault.exe	102
8	2500	WerFault.exe	102
2196	2500	WerFault.exe	102
5008	2500	WerFault.exe	102
4012	2500	WerFault.exe	102
2828	2500	WerFault.exe	102

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	advancePayment-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 4020 wrote to memory of 2500	4020	advancePayment-pdf.exe	102
PID 4020 wrote to memory of 2500	4020	advancePayment-pdf.exe	102
PID 4020 wrote to memory of 2500	4020	advancePayment-pdf.exe	102

C:\Users\Admin\AppData\Local\Temp\advancePayment-pdf.exe
"C:\Users\Admin\AppData\Local\Temp\advancePayment-pdf.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4020
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4020 -s 964
  2⤵
  - Program crash
  PID:4136
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4020 -s 1004
  2⤵
  - Program crash
  PID:4208
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4020 -s 1012
  2⤵
  - Program crash
  PID:4496
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4020 -s 1124
  2⤵
  - Program crash
  PID:2544
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4020 -s 1108
  2⤵
  - Program crash
  PID:4684
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4020 -s 1164
  2⤵
  - Program crash
  PID:2176
- 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:2500
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2500 -s 616
    3⤵
    - Program crash
    PID:232
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2500 -s 700
    3⤵
    - Program crash
    PID:2992
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2500 -s 712
    3⤵
    - Program crash
    PID:2172
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2500 -s 712
    3⤵
    - Program crash
    PID:3404
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2500 -s 708
    3⤵
    - Program crash
    PID:2684
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2500 -s 928
    3⤵
    - Program crash
    PID:4708
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2500 -s 968
    3⤵
    - Program crash
    PID:3028
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2500 -s 988
    3⤵
    - Program crash
    PID:2360
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2500 -s 928
    3⤵
    - Program crash
    PID:3928
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2500 -s 1064
    3⤵
    - Program crash
    PID:2796
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2500 -s 1208
    3⤵
    - Program crash
    PID:1936
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2500 -s 748
    3⤵
    - Program crash
    PID:5008
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2500 -s 1232
    3⤵
    - Program crash
    PID:1984
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2500 -s 1312
    3⤵
    - Program crash
    PID:3272
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2500 -s 1404
    3⤵
    - Program crash
    PID:3364
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2500 -s 1424
    3⤵
    - Program crash
    PID:952
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2500 -s 1388
    3⤵
    - Program crash
    PID:8
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2500 -s 1460
    3⤵
    - Program crash
    PID:2196
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2500 -s 1412
    3⤵
    - Program crash
    PID:5008
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2500 -s 1428
    3⤵
    - Program crash
    PID:4012
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2500 -s 924
    3⤵
    - Program crash
    PID:2828
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4020 -s 1168
  2⤵
  - Program crash
  PID:3452

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 4020 -ip 4020
1⤵
PID:2120

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 184 -p 4020 -ip 4020
1⤵
PID:1372

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 4020 -ip 4020
1⤵
PID:1528

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 4020 -ip 4020
1⤵
PID:3668

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 4020 -ip 4020
1⤵
PID:4788

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 4020 -ip 4020
1⤵
PID:2832

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 536 -p 4020 -ip 4020
1⤵
PID:4968

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 2500 -ip 2500
1⤵
PID:3272

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 520 -p 2500 -ip 2500
1⤵
PID:1412

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 544 -p 2500 -ip 2500
1⤵
PID:2244

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 2500 -ip 2500
1⤵
PID:3500

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 496 -p 2500 -ip 2500
1⤵
PID:3952

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 2500 -ip 2500
1⤵
PID:4028

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 2500 -ip 2500
1⤵
PID:664

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 2500 -ip 2500
1⤵
PID:860

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 2500 -ip 2500
1⤵
PID:4236

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 496 -p 2500 -ip 2500
1⤵
PID:1848

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 2500 -ip 2500
1⤵
PID:920

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 520 -p 2500 -ip 2500
1⤵
PID:4580

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 2500 -ip 2500
1⤵
PID:1852

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 2500 -ip 2500
1⤵
PID:3388

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 2500 -ip 2500
1⤵
PID:3628

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 2500 -ip 2500
1⤵
PID:552

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 496 -p 2500 -ip 2500
1⤵
PID:456

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 2500 -ip 2500
1⤵
PID:4424

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 2500 -ip 2500
1⤵
PID:4484

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 2500 -ip 2500
1⤵
PID:5040

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 2500 -ip 2500
1⤵
PID:3816

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
537KB

MD5
821cd5ef8d94deeeee5b7cb82379c212

SHA1
977f8407a7033b20b96fec686e918c177160ae92

SHA256
8038ff6a41673eb151cdb7f03872c741dc762834c856d70030cd54af744e36a4

SHA512
0f4f856cf1cc965a5be602503eb3f26cee460c5b2ce709ed2f7672973da801a4cc9bd7a67f9b2ffe7471421b67d44a51c302ff98bd065febbf1d73ebe54a9881

Download Submit
memory/2500-31-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2500-33-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2500-27-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2500-28-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2500-26-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2500-38-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2500-19-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2500-20-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2500-21-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2500-23-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2500-24-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2500-25-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2500-39-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2500-37-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2500-36-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2500-29-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2500-30-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2500-35-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2500-32-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/2500-34-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/4020-3-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4020-2-0x00000000048E0000-0x000000000495A000-memory.dmp

Filesize
488KB

Download
memory/4020-16-0x00000000048E0000-0x000000000495A000-memory.dmp

Filesize
488KB

Download
memory/4020-1-0x0000000002D40000-0x0000000002E40000-memory.dmp

Filesize
1024KB

Download
memory/4020-15-0x0000000000400000-0x0000000002B8B000-memory.dmp

Filesize
39.5MB

Download
memory/4020-17-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads