remcos | 48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f

General

Target

48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f.exe
Size

514KB
MD5

78c37a72c91559ed73b7cbec99534bfc
SHA1

7813d8411e63c5599cd3c85ed306e2e04562c079
SHA256

48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f
SHA512

05a46f20499096180ec46b9b25e97a5b539aa0d70fc5c0b9884b4438ff9503a6afeb44495dfda9d312bd254de830ee45c1ef431b9356311ee0beacd51685d2ad
SSDEEP

12288:do1AcqnUMOYXUDCe+NaxMVkb7LrTwrC+X:doGHUMOL1AawkLrYC+X

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
2952	yavascript.exe

Loads dropped DLL 2 IoCs

pid	Process
2336	48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f.exe
2336	48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f.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-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\Run\Rmc-I7G983 = "\"C:\\Users\\Admin\\AppData\\Roaming\\xenor\\yavascript.exe\""	yavascript.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3290804112-2823094203-3137964600-1000\Software\Microsoft\Windows\CurrentVersion\Run\Rmc-I7G983 = "\"C:\\Users\\Admin\\AppData\\Roaming\\xenor\\yavascript.exe\""	48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f.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	48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	yavascript.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2336 wrote to memory of 2952	2336	48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f.exe	31
PID 2336 wrote to memory of 2952	2336	48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f.exe	31
PID 2336 wrote to memory of 2952	2336	48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f.exe	31
PID 2336 wrote to memory of 2952	2336	48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f.exe	31

C:\Users\Admin\AppData\Local\Temp\48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f.exe
"C:\Users\Admin\AppData\Local\Temp\48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f.exe"
1⤵
- Loads dropped DLL
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2336
- 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:2952

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
514KB

MD5
78c37a72c91559ed73b7cbec99534bfc

SHA1
7813d8411e63c5599cd3c85ed306e2e04562c079

SHA256
48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f

SHA512
05a46f20499096180ec46b9b25e97a5b539aa0d70fc5c0b9884b4438ff9503a6afeb44495dfda9d312bd254de830ee45c1ef431b9356311ee0beacd51685d2ad

Download Submit
memory/2336-0-0x0000000000250000-0x0000000000294000-memory.dmp

Filesize
272KB

Download
memory/2336-1-0x0000000000490000-0x000000000050A000-memory.dmp

Filesize
488KB

Download
memory/2336-2-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2336-15-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/2336-14-0x0000000000490000-0x000000000050A000-memory.dmp

Filesize
488KB

Download
memory/2336-13-0x0000000000250000-0x0000000000294000-memory.dmp

Filesize
272KB

Download
memory/2336-12-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2952-20-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2952-25-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2952-18-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2952-19-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2952-16-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2952-21-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2952-22-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2952-23-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2952-24-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2952-17-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2952-26-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2952-27-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2952-28-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2952-29-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2952-30-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2952-31-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2952-32-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2952-33-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads