remcos | 4d8f242a1d64b3b41748d2bd56ee6f7119434dedcdf793a83cea95fb31d13347

General

Target

4d8f242a1d64b3b41748d2bd56ee6f7119434dedcdf793a83cea95fb31d13347.exe
Size

388KB
MD5

a0acd7920f09a59331e008f8d3dc7ac1
SHA1

f6bf51b2bccc91476136e43a91b17076ed78b083
SHA256

4d8f242a1d64b3b41748d2bd56ee6f7119434dedcdf793a83cea95fb31d13347
SHA512

10aa260961df5472b9b79a72fb9ab1a4ea9c088c817db107f9355fbb7b6b3369b17127933ead6b10a01e4270e3f533e37699eeb77dd084d8821d47c5fc5c870e
SSDEEP

6144:pvesyWj0MhFpikvYFmSkoxT88KaUqcZLROqNwlggoWLOEC:pesyY0M3xvYDY8KgchIvlgXWy

Score

10^/10

remcos yavakosa discovery persistence rat

Malware Config

Extracted

Family

remcos

Botnet

Yavakosa

C2

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

Executes dropped EXE 1 IoCs

pid	Process
2620	yavascript.exe

Loads dropped DLL 2 IoCs

pid	Process
2188	4d8f242a1d64b3b41748d2bd56ee6f7119434dedcdf793a83cea95fb31d13347.exe
2188	4d8f242a1d64b3b41748d2bd56ee6f7119434dedcdf793a83cea95fb31d13347.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-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\Rmc-I7G983 = "\"C:\\Users\\Admin\\AppData\\Roaming\\xenor\\yavascript.exe\""	4d8f242a1d64b3b41748d2bd56ee6f7119434dedcdf793a83cea95fb31d13347.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000\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

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	4d8f242a1d64b3b41748d2bd56ee6f7119434dedcdf793a83cea95fb31d13347.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	yavascript.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2188 wrote to memory of 2620	2188	4d8f242a1d64b3b41748d2bd56ee6f7119434dedcdf793a83cea95fb31d13347.exe	30
PID 2188 wrote to memory of 2620	2188	4d8f242a1d64b3b41748d2bd56ee6f7119434dedcdf793a83cea95fb31d13347.exe	30
PID 2188 wrote to memory of 2620	2188	4d8f242a1d64b3b41748d2bd56ee6f7119434dedcdf793a83cea95fb31d13347.exe	30
PID 2188 wrote to memory of 2620	2188	4d8f242a1d64b3b41748d2bd56ee6f7119434dedcdf793a83cea95fb31d13347.exe	30

C:\Users\Admin\AppData\Local\Temp\4d8f242a1d64b3b41748d2bd56ee6f7119434dedcdf793a83cea95fb31d13347.exe
"C:\Users\Admin\AppData\Local\Temp\4d8f242a1d64b3b41748d2bd56ee6f7119434dedcdf793a83cea95fb31d13347.exe"
1⤵
- Loads dropped DLL
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2188
- 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:2620

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
388KB

MD5
a0acd7920f09a59331e008f8d3dc7ac1

SHA1
f6bf51b2bccc91476136e43a91b17076ed78b083

SHA256
4d8f242a1d64b3b41748d2bd56ee6f7119434dedcdf793a83cea95fb31d13347

SHA512
10aa260961df5472b9b79a72fb9ab1a4ea9c088c817db107f9355fbb7b6b3369b17127933ead6b10a01e4270e3f533e37699eeb77dd084d8821d47c5fc5c870e

Download Submit
memory/2188-0-0x00000000002D0000-0x0000000000314000-memory.dmp

Filesize
272KB

Download
memory/2188-1-0x0000000000320000-0x000000000039A000-memory.dmp

Filesize
488KB

Download
memory/2188-2-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2188-15-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2188-14-0x00000000002D0000-0x0000000000314000-memory.dmp

Filesize
272KB

Download
memory/2188-13-0x0000000000320000-0x000000000039A000-memory.dmp

Filesize
488KB

Download
memory/2620-21-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2620-25-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2620-18-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2620-19-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2620-20-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2620-16-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2620-22-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2620-23-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2620-24-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2620-17-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2620-26-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2620-27-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2620-28-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2620-29-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2620-30-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2620-31-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2620-32-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2620-33-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads