remcos | 48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f

General

Target

Sigmanly_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

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	Sigmanly_48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f.exe

Executes dropped EXE 1 IoCs

pid	Process
2484	yavascript.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-1-5-21-940901362-3608833189-1915618603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Rmc-I7G983 = "\"C:\\Users\\Admin\\AppData\\Roaming\\xenor\\yavascript.exe\""	Sigmanly_48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\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

Program crash 14 IoCs

pid	pid_target	Process	procid_target
952	4808	WerFault.exe	82
3548	4808	WerFault.exe	82
3872	4808	WerFault.exe	82
1704	4808	WerFault.exe	82
4376	4808	WerFault.exe	82
3036	4808	WerFault.exe	82
2440	4808	WerFault.exe	82
1120	2484	WerFault.exe	96
2608	2484	WerFault.exe	96
3304	2484	WerFault.exe	96
2028	2484	WerFault.exe	96
2156	2484	WerFault.exe	96
4320	2484	WerFault.exe	96
840	2484	WerFault.exe	96

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	Sigmanly_48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	yavascript.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 4808 wrote to memory of 2484	4808	Sigmanly_48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f.exe	96
PID 4808 wrote to memory of 2484	4808	Sigmanly_48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f.exe	96
PID 4808 wrote to memory of 2484	4808	Sigmanly_48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f.exe	96

C:\Users\Admin\AppData\Local\Temp\Sigmanly_48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f.exe
"C:\Users\Admin\AppData\Local\Temp\Sigmanly_48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4808
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4808 -s 968
  2⤵
  - Program crash
  PID:952
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4808 -s 1044
  2⤵
  - Program crash
  PID:3548
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4808 -s 1108
  2⤵
  - Program crash
  PID:3872
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4808 -s 976
  2⤵
  - Program crash
  PID:1704
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4808 -s 976
  2⤵
  - Program crash
  PID:4376
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4808 -s 1136
  2⤵
  - Program crash
  PID:3036
- 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:2484
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2484 -s 244
    3⤵
    - Program crash
    PID:1120
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2484 -s 644
    3⤵
    - Program crash
    PID:2608
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2484 -s 244
    3⤵
    - Program crash
    PID:3304
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2484 -s 656
    3⤵
    - Program crash
    PID:2028
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2484 -s 752
    3⤵
    - Program crash
    PID:2156
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2484 -s 652
    3⤵
    - Program crash
    PID:4320
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2484 -s 244
    3⤵
    - Program crash
    PID:840
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4808 -s 1300
  2⤵
  - Program crash
  PID:2440

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 4808 -ip 4808
1⤵
PID:4432

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 364 -p 4808 -ip 4808
1⤵
PID:4372

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4808 -ip 4808
1⤵
PID:1672

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 368 -p 4808 -ip 4808
1⤵
PID:2104

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4808 -ip 4808
1⤵
PID:548

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 4808 -ip 4808
1⤵
PID:5064

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4808 -ip 4808
1⤵
PID:604

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 2484 -ip 2484
1⤵
PID:4676

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 2484 -ip 2484
1⤵
PID:4584

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 2484 -ip 2484
1⤵
PID:1452

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 2484 -ip 2484
1⤵
PID:4772

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 2484 -ip 2484
1⤵
PID:312

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 2484 -ip 2484
1⤵
PID:2936

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 368 -p 2484 -ip 2484
1⤵
PID:748

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

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\xenor\yavascript.exe

Filesize
514KB

MD5
78c37a72c91559ed73b7cbec99534bfc

SHA1
7813d8411e63c5599cd3c85ed306e2e04562c079

SHA256
48773abdad4ef3e8339d4ed2aa02f9d41611e02aefd9e93b0833a2ab99a1619f

SHA512
05a46f20499096180ec46b9b25e97a5b539aa0d70fc5c0b9884b4438ff9503a6afeb44495dfda9d312bd254de830ee45c1ef431b9356311ee0beacd51685d2ad

Download Submit
memory/2484-25-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2484-30-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2484-33-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2484-32-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2484-31-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2484-21-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2484-29-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2484-15-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2484-16-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2484-17-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2484-18-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2484-19-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2484-28-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2484-20-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2484-26-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2484-23-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2484-24-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2484-27-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/2484-22-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/4808-0-0x0000000000560000-0x00000000005A4000-memory.dmp

Filesize
272KB

Download
memory/4808-2-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4808-12-0x0000000000560000-0x00000000005A4000-memory.dmp

Filesize
272KB

Download
memory/4808-13-0x0000000002130000-0x00000000021AA000-memory.dmp

Filesize
488KB

Download
memory/4808-14-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4808-11-0x0000000000400000-0x0000000000488000-memory.dmp

Filesize
544KB

Download
memory/4808-1-0x0000000002130000-0x00000000021AA000-memory.dmp

Filesize
488KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads