remcos | 256f272b1eabec53f2430058b66870b8d11713bcec054b09d92d64434ce6e00a

General

Target

libvlc.dll
Size

3.9MB
MD5

7254a4eeaf6aa5b5b659459f004cc318
SHA1

6d1949307a3caf2720e877bffca3693f57e051b6
SHA256

a4dd94549a12928ea8eda1308db053d3e2d0e776c8a0c9773f880c98710d8e22
SHA512

053b69ed2555cd0b663e2cf39dde193c224bb864ce3a8416182f146ff3d42e56a0fb4e10a72954480e2d13dff142b11c86b5d51c2c5528a43f1a2221956a5d2c
SSDEEP

49152:zYYY6YxEjcOBlRTVLFujV0mBpluFWse9R+xhYlzwY:F3tFuCm68

Score

10^/10

remcos 855 discovery rat

Malware Config

Extracted

Family

remcos

Botnet

855

C2

23.94.82.22:5890

Attributes

audio_folder
MicRecords
audio_path
ApplicationPath
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
remcos.exe
copy_folder
Remcos
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
false
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
835-S89137
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

Downloads MZ/PE file 1 IoCs

flow	pid	Process
55	2568	Process not Found

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1944 set thread context of 3040	1944	rundll32.exe	88

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	aspnet_wp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MicrosoftEdgeUpdate.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
4936	MicrosoftEdgeUpdate.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1944 wrote to memory of 3040	1944	rundll32.exe	88
PID 1944 wrote to memory of 3040	1944	rundll32.exe	88
PID 1944 wrote to memory of 3040	1944	rundll32.exe	88
PID 1944 wrote to memory of 3040	1944	rundll32.exe	88
PID 1944 wrote to memory of 3040	1944	rundll32.exe	88
PID 1944 wrote to memory of 3040	1944	rundll32.exe	88
PID 1944 wrote to memory of 3040	1944	rundll32.exe	88
PID 1944 wrote to memory of 3040	1944	rundll32.exe	88
PID 1944 wrote to memory of 3040	1944	rundll32.exe	88
PID 1944 wrote to memory of 3040	1944	rundll32.exe	88

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\libvlc.dll,#1
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1944
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  PID:3040

C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
"C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ping 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-PGFwcCBhcHBpZD0iezhBNjlEMzQ1LUQ1NjQtNDYzYy1BRkYxLUE2OUQ5RTUzMEY5Nn0iIHZlcnNpb249IjEyMy4wLjYzMTIuMTIzIiBuZXh0dmVyc2lvbj0iIiBsYW5nPSJlbiIgYnJhbmQ9IkdHTFMiIGNsaWVudD0iIiBpbnN0YWxsYWdlPSIxIiBpbnN0YWxsZGF0ZXRpbWU9IjE3MzkyODMyMzYiIG9vYmVfaW5zdGFsbF90aW1lPSIxMzM4Mzc1NDI1MTE0ODAwMDAiPjxldmVudCBldmVudHR5cGU9IjMxIiBldmVudHJlc3VsdD0iMSIgZXJyb3Jjb2RlPSIwIiBleHRyYWNvZGUxPSIyMTc5ODYyIiBzeXN0ZW1fdXB0aW1lX3RpY2tzPSI1OTY2OTAzODAyIi8-PC9hcHA-PC9yZXF1ZXN0Pg
1⤵
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
PID:4936

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1944-0-0x000001C151AE0000-0x000001C151AF0000-memory.dmp

Filesize
64KB

Download
memory/3040-2-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/3040-1-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/3040-3-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/3040-6-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/3040-5-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/3040-4-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/3040-7-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/3040-8-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/3040-9-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/3040-11-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/3040-12-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/3040-14-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/3040-13-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/3040-15-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/3040-16-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/3040-18-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/3040-19-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/3040-20-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/3040-21-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/3040-22-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/3040-23-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download

Analysis

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