remcos | 0b7faafb8da0c827bd09a35795d30bb4a703e6ad53c5ca99cfdd1cbfd63dd55f

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

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-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

Executes dropped EXE 1 IoCs

pid	Process
2220	yavascript.exe

Loads dropped DLL 2 IoCs

pid	Process
2124	documents.exe
2124	documents.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-DCHPS3 = "\"C:\\Users\\Admin\\AppData\\Roaming\\xenor\\yavascript.exe\""	documents.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000\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

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 4 IoCs

description	pid	Process	procid_target
PID 2124 wrote to memory of 2220	2124	documents.exe	30
PID 2124 wrote to memory of 2220	2124	documents.exe	30
PID 2124 wrote to memory of 2220	2124	documents.exe	30
PID 2124 wrote to memory of 2220	2124	documents.exe	30

C:\Users\Admin\AppData\Local\Temp\documents.exe
"C:\Users\Admin\AppData\Local\Temp\documents.exe"
1⤵
- Loads dropped DLL
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2124
- 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:2220

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
488KB

MD5
bf94dfb3c600fea20a0eb3b6f2ce410f

SHA1
9be4b304813ff777c1f5aa753dabe2b4aeb07391

SHA256
0b7faafb8da0c827bd09a35795d30bb4a703e6ad53c5ca99cfdd1cbfd63dd55f

SHA512
00c72914e7344bb25b20296cb215bd3c53246eb4b55ca176ffb2a9226444d0ba992699337c76815e6a127738a8d616e466f06e2b3808e73397dc54eddf60891a

Download Submit
memory/2124-1-0x0000000000670000-0x0000000000770000-memory.dmp

Filesize
1024KB

Download
memory/2124-2-0x0000000000270000-0x00000000002EA000-memory.dmp

Filesize
488KB

Download
memory/2124-4-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2124-16-0x0000000000270000-0x00000000002EA000-memory.dmp

Filesize
488KB

Download
memory/2124-15-0x0000000000670000-0x0000000000770000-memory.dmp

Filesize
1024KB

Download
memory/2124-14-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2124-13-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2220-23-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2220-28-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2220-20-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2220-22-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2220-18-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2220-24-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2220-25-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2220-26-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2220-27-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2220-19-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2220-29-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2220-30-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2220-31-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2220-32-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2220-33-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2220-34-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2220-35-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2220-36-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download
memory/2220-37-0x0000000000400000-0x00000000004E6000-memory.dmp

Filesize
920KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads