remcos | e5d4dd5cfd8214af02cc82d94a47a411df696b12e9ba94ad73193263b9527bb3

General

Target

inspectionDocs1-pdf.exe
Size

487KB
MD5

01f1edaadf867c124fceea9dbfa1ed29
SHA1

d69c565e28e2f49cf04641c7777b31d15ba3bb96
SHA256

657047361a9c9c09c96808adbdcec56a17f7e5a5e11ea4565d88b6dcdb2a7fc6
SHA512

6b26c141c7152a12fa2c2ae0595dc148d0525c7e250ca32008764bddf35bfb0fa360c1adc6120de8fcc731a3e3ba5db70f4c221ef2b6fde2ef19619f7ec4bb3b
SSDEEP

12288:GKcpQDXSv1Bt/rs0MoyfMsSAHY7R/6s/nA4h:GlCS13Ly5SAHAR/6+nAC

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
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-T59BEJ
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

Executes dropped EXE 1 IoCs

pid	Process
2696	yavascript.exe

Loads dropped DLL 2 IoCs

pid	Process
292	inspectionDocs1-pdf.exe
292	inspectionDocs1-pdf.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-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Windows\CurrentVersion\Run\Rmc-T59BEJ = "\"C:\\Users\\Admin\\AppData\\Roaming\\yavascript.exe\""	inspectionDocs1-pdf.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Windows\CurrentVersion\Run\Rmc-T59BEJ = "\"C:\\Users\\Admin\\AppData\\Roaming\\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	inspectionDocs1-pdf.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	yavascript.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 292 wrote to memory of 2696	292	inspectionDocs1-pdf.exe	30
PID 292 wrote to memory of 2696	292	inspectionDocs1-pdf.exe	30
PID 292 wrote to memory of 2696	292	inspectionDocs1-pdf.exe	30
PID 292 wrote to memory of 2696	292	inspectionDocs1-pdf.exe	30

C:\Users\Admin\AppData\Local\Temp\inspectionDocs1-pdf.exe
"C:\Users\Admin\AppData\Local\Temp\inspectionDocs1-pdf.exe"
1⤵
- Loads dropped DLL
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:292
- C:\Users\Admin\AppData\Roaming\yavascript.exe
  "C:\Users\Admin\AppData\Roaming\yavascript.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  PID:2696

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\yavascript.exe

Filesize
487KB

MD5
01f1edaadf867c124fceea9dbfa1ed29

SHA1
d69c565e28e2f49cf04641c7777b31d15ba3bb96

SHA256
657047361a9c9c09c96808adbdcec56a17f7e5a5e11ea4565d88b6dcdb2a7fc6

SHA512
6b26c141c7152a12fa2c2ae0595dc148d0525c7e250ca32008764bddf35bfb0fa360c1adc6120de8fcc731a3e3ba5db70f4c221ef2b6fde2ef19619f7ec4bb3b

Download Submit
memory/292-1-0x00000000005E0000-0x00000000006E0000-memory.dmp

Filesize
1024KB

Download
memory/292-2-0x00000000002B0000-0x000000000032A000-memory.dmp

Filesize
488KB

Download
memory/292-3-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/292-15-0x00000000002B0000-0x000000000032A000-memory.dmp

Filesize
488KB

Download
memory/292-14-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/292-13-0x0000000000400000-0x0000000000558000-memory.dmp

Filesize
1.3MB

Download
memory/2696-23-0x0000000000400000-0x0000000000558000-memory.dmp

Filesize
1.3MB

Download
memory/2696-27-0x0000000000400000-0x0000000000558000-memory.dmp

Filesize
1.3MB

Download
memory/2696-17-0x0000000000400000-0x0000000000558000-memory.dmp

Filesize
1.3MB

Download
memory/2696-20-0x0000000000400000-0x0000000000558000-memory.dmp

Filesize
1.3MB

Download
memory/2696-22-0x0000000000400000-0x0000000000558000-memory.dmp

Filesize
1.3MB

Download
memory/2696-19-0x0000000000400000-0x0000000000558000-memory.dmp

Filesize
1.3MB

Download
memory/2696-24-0x0000000000400000-0x0000000000558000-memory.dmp

Filesize
1.3MB

Download
memory/2696-25-0x0000000000400000-0x0000000000558000-memory.dmp

Filesize
1.3MB

Download
memory/2696-26-0x0000000000400000-0x0000000000558000-memory.dmp

Filesize
1.3MB

Download
memory/2696-18-0x0000000000400000-0x0000000000558000-memory.dmp

Filesize
1.3MB

Download
memory/2696-28-0x0000000000400000-0x0000000000558000-memory.dmp

Filesize
1.3MB

Download
memory/2696-29-0x0000000000400000-0x0000000000558000-memory.dmp

Filesize
1.3MB

Download
memory/2696-30-0x0000000000400000-0x0000000000558000-memory.dmp

Filesize
1.3MB

Download
memory/2696-31-0x0000000000400000-0x0000000000558000-memory.dmp

Filesize
1.3MB

Download
memory/2696-32-0x0000000000400000-0x0000000000558000-memory.dmp

Filesize
1.3MB

Download
memory/2696-33-0x0000000000400000-0x0000000000558000-memory.dmp

Filesize
1.3MB

Download
memory/2696-34-0x0000000000400000-0x0000000000558000-memory.dmp

Filesize
1.3MB

Download
memory/2696-35-0x0000000000400000-0x0000000000558000-memory.dmp

Filesize
1.3MB

Download
memory/2696-36-0x0000000000400000-0x0000000000558000-memory.dmp

Filesize
1.3MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads