remcos | 0e184edac45ddeaf7ca4681b65e7b4accafb6705032faf6d2f6a61d2ef6d1ded

General

Target

requests-pdf.exe
Size

474KB
MD5

36c9bb380d71f7ad243b57c522fc2768
SHA1

ef2eb660d985bfb693fcdb5b81c3ccffb9763646
SHA256

0e184edac45ddeaf7ca4681b65e7b4accafb6705032faf6d2f6a61d2ef6d1ded
SHA512

e28112d772dbacfae29de2b6b866f51ecad05278c2dc2a87bc73c6817a0c5db8310bea2de7b22a05a69a529858bdc5eae0537f9ec4238e9d8bc7e37e84678e0f
SSDEEP

6144:w5C+1+ZjpLnXIc5qM2ssBvQvSDfMe9v5lxtJQwNbG1Aflpw4CWffeM:w5C+I5JnYSidt3DPNbG1ENCWZ

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
2772	yavascript.exe

Loads dropped DLL 2 IoCs

pid	Process
432	requests-pdf.exe
432	requests-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-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\Rmc-I7G983 = "\"C:\\Users\\Admin\\AppData\\Roaming\\xenor\\yavascript.exe\""	requests-pdf.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	requests-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 432 wrote to memory of 2772	432	requests-pdf.exe	29
PID 432 wrote to memory of 2772	432	requests-pdf.exe	29
PID 432 wrote to memory of 2772	432	requests-pdf.exe	29
PID 432 wrote to memory of 2772	432	requests-pdf.exe	29

C:\Users\Admin\AppData\Local\Temp\requests-pdf.exe
"C:\Users\Admin\AppData\Local\Temp\requests-pdf.exe"
1⤵
- Loads dropped DLL
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:432
- 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:2772

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
474KB

MD5
36c9bb380d71f7ad243b57c522fc2768

SHA1
ef2eb660d985bfb693fcdb5b81c3ccffb9763646

SHA256
0e184edac45ddeaf7ca4681b65e7b4accafb6705032faf6d2f6a61d2ef6d1ded

SHA512
e28112d772dbacfae29de2b6b866f51ecad05278c2dc2a87bc73c6817a0c5db8310bea2de7b22a05a69a529858bdc5eae0537f9ec4238e9d8bc7e37e84678e0f

Download Submit
memory/432-1-0x00000000008E0000-0x00000000009E0000-memory.dmp

Filesize
1024KB

Download
memory/432-2-0x00000000002C0000-0x000000000033A000-memory.dmp

Filesize
488KB

Download
memory/432-3-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/432-16-0x00000000002C0000-0x000000000033A000-memory.dmp

Filesize
488KB

Download
memory/432-15-0x00000000008E0000-0x00000000009E0000-memory.dmp

Filesize
1024KB

Download
memory/432-14-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/432-13-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/2772-23-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/2772-28-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/2772-22-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/2772-21-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/2772-18-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/2772-24-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/2772-25-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/2772-26-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/2772-27-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/2772-19-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/2772-29-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/2772-30-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/2772-31-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/2772-32-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/2772-33-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/2772-34-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/2772-35-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download
memory/2772-36-0x0000000000400000-0x000000000084D000-memory.dmp

Filesize
4.3MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads