remcos | ed1416c90a49177106cbea5b7551756e06fee46d77fde4879b8735ec56dd54b4

General

Target

ed1416c90a49177106cbea5b7551756e06fee46d77fde4879b8735ec56dd54b4.exe
Size

448KB
MD5

73666f4d35944f20b34c150b8d9df538
SHA1

8548d775b3475704dfe36e30d3bf115d8964330c
SHA256

ed1416c90a49177106cbea5b7551756e06fee46d77fde4879b8735ec56dd54b4
SHA512

c39ffd67e6418b5fbdc8ae595bc041c3b250e38f7d6ccb132104d592a3fd8cfa7a301dd4531e16ddb48d367977637a8d004dc2712416744ec5cc9e5e24b22433
SSDEEP

12288:yg3o/PnH46JeFGv6m6cCRk6qdg52Kcaj:ytv4HsimURudg53

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
2812	yavascript.exe

Loads dropped DLL 2 IoCs

pid	Process
2736	ed1416c90a49177106cbea5b7551756e06fee46d77fde4879b8735ec56dd54b4.exe
2736	ed1416c90a49177106cbea5b7551756e06fee46d77fde4879b8735ec56dd54b4.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-1-5-21-312935884-697965778-3955649944-1000\Software\Microsoft\Windows\CurrentVersion\Run\Rmc-I7G983 = "\"C:\\Users\\Admin\\AppData\\Roaming\\xenor\\yavascript.exe\""	ed1416c90a49177106cbea5b7551756e06fee46d77fde4879b8735ec56dd54b4.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-312935884-697965778-3955649944-1000\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	ed1416c90a49177106cbea5b7551756e06fee46d77fde4879b8735ec56dd54b4.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	yavascript.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2736 wrote to memory of 2812	2736	ed1416c90a49177106cbea5b7551756e06fee46d77fde4879b8735ec56dd54b4.exe	30
PID 2736 wrote to memory of 2812	2736	ed1416c90a49177106cbea5b7551756e06fee46d77fde4879b8735ec56dd54b4.exe	30
PID 2736 wrote to memory of 2812	2736	ed1416c90a49177106cbea5b7551756e06fee46d77fde4879b8735ec56dd54b4.exe	30
PID 2736 wrote to memory of 2812	2736	ed1416c90a49177106cbea5b7551756e06fee46d77fde4879b8735ec56dd54b4.exe	30

C:\Users\Admin\AppData\Local\Temp\ed1416c90a49177106cbea5b7551756e06fee46d77fde4879b8735ec56dd54b4.exe
"C:\Users\Admin\AppData\Local\Temp\ed1416c90a49177106cbea5b7551756e06fee46d77fde4879b8735ec56dd54b4.exe"
1⤵
- Loads dropped DLL
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2736
- 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:2812

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
448KB

MD5
73666f4d35944f20b34c150b8d9df538

SHA1
8548d775b3475704dfe36e30d3bf115d8964330c

SHA256
ed1416c90a49177106cbea5b7551756e06fee46d77fde4879b8735ec56dd54b4

SHA512
c39ffd67e6418b5fbdc8ae595bc041c3b250e38f7d6ccb132104d592a3fd8cfa7a301dd4531e16ddb48d367977637a8d004dc2712416744ec5cc9e5e24b22433

Download Submit
memory/2736-1-0x0000000000900000-0x0000000000A00000-memory.dmp

Filesize
1024KB

Download
memory/2736-2-0x0000000000340000-0x00000000003BA000-memory.dmp

Filesize
488KB

Download
memory/2736-3-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2736-15-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2736-14-0x0000000000340000-0x00000000003BA000-memory.dmp

Filesize
488KB

Download
memory/2736-13-0x0000000000400000-0x0000000000847000-memory.dmp

Filesize
4.3MB

Download
memory/2812-23-0x0000000000400000-0x0000000000847000-memory.dmp

Filesize
4.3MB

Download
memory/2812-27-0x0000000000400000-0x0000000000847000-memory.dmp

Filesize
4.3MB

Download
memory/2812-20-0x0000000000400000-0x0000000000847000-memory.dmp

Filesize
4.3MB

Download
memory/2812-21-0x0000000000400000-0x0000000000847000-memory.dmp

Filesize
4.3MB

Download
memory/2812-22-0x0000000000400000-0x0000000000847000-memory.dmp

Filesize
4.3MB

Download
memory/2812-17-0x0000000000400000-0x0000000000847000-memory.dmp

Filesize
4.3MB

Download
memory/2812-24-0x0000000000400000-0x0000000000847000-memory.dmp

Filesize
4.3MB

Download
memory/2812-25-0x0000000000400000-0x0000000000847000-memory.dmp

Filesize
4.3MB

Download
memory/2812-26-0x0000000000400000-0x0000000000847000-memory.dmp

Filesize
4.3MB

Download
memory/2812-18-0x0000000000400000-0x0000000000847000-memory.dmp

Filesize
4.3MB

Download
memory/2812-28-0x0000000000400000-0x0000000000847000-memory.dmp

Filesize
4.3MB

Download
memory/2812-29-0x0000000000400000-0x0000000000847000-memory.dmp

Filesize
4.3MB

Download
memory/2812-30-0x0000000000400000-0x0000000000847000-memory.dmp

Filesize
4.3MB

Download
memory/2812-31-0x0000000000400000-0x0000000000847000-memory.dmp

Filesize
4.3MB

Download
memory/2812-32-0x0000000000400000-0x0000000000847000-memory.dmp

Filesize
4.3MB

Download
memory/2812-33-0x0000000000400000-0x0000000000847000-memory.dmp

Filesize
4.3MB

Download
memory/2812-34-0x0000000000400000-0x0000000000847000-memory.dmp

Filesize
4.3MB

Download
memory/2812-35-0x0000000000400000-0x0000000000847000-memory.dmp

Filesize
4.3MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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