remcos | 55f131be9f75250cc1291aafe4bc1593d460bcc71c62da5437aa14c894cf22f3

Analysis

max time kernel
148s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
25-12-2024 03:09

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General

Target

$PLUGINSDIR/gb7ir8nsaimu39b.dll
Size

149KB
MD5

0c44ee25d7c510783d118d3f76d88b3b
SHA1

ff537d185513d1a2daf91ca5679c79f3c8346e9a
SHA256

0b54c2abb6bee336adc1866f128591a6e0d5fa0f90333f6a6b57205b41196e20
SHA512

a13490eb75a842e15ae33cb167209e76dbfb7b1fe96530ca3bd41ff2a4318717b53a5e44bb1f0f2523f38888e142061019082ffb11bc633953a773b25e2fc587
SSDEEP

3072:zakbhW2I5O+aiKzEV6o7dkH6ChVLOSV49p6vfESJvAEVXUOQn3r+e2:zjbM2SwbUJ6HrLOHovfFNAE23r+e2

Score

10^/10

remcos grace _ marcy discovery rat

Malware Config

Extracted

Family

remcos

Version

2.7.2 Pro

Botnet

GRACE _ MARCY

103.153.77.83:4348

Attributes

audio_folder
MicRecords
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
mozila.exe
copy_folder
mozila
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
false
install_path
%AppData%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
mozila
keylog_path
%AppData%
mouse_option
false
mutex
mozila-VR8Q9A
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
mozila
take_screenshot_option
false
take_screenshot_time
5
take_screenshot_title
wikipedia;solitaire;

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Remcos family
remcos

Blocklisted process makes network request 7 IoCs

flow	pid	Process
2	3824	rundll32.exe
22	3824	rundll32.exe
36	3824	rundll32.exe
40	3824	rundll32.exe
41	3824	rundll32.exe
48	3824	rundll32.exe
49	3824	rundll32.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4964 set thread context of 3824	4964	rundll32.exe	84

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	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe
4964	rundll32.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
4964	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3824	rundll32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 2052 wrote to memory of 4964	2052	rundll32.exe	83
PID 2052 wrote to memory of 4964	2052	rundll32.exe	83
PID 2052 wrote to memory of 4964	2052	rundll32.exe	83
PID 4964 wrote to memory of 3824	4964	rundll32.exe	84
PID 4964 wrote to memory of 3824	4964	rundll32.exe	84
PID 4964 wrote to memory of 3824	4964	rundll32.exe	84
PID 4964 wrote to memory of 3824	4964	rundll32.exe	84

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\gb7ir8nsaimu39b.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:2052
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\gb7ir8nsaimu39b.dll,#1
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:4964
- - C:\Windows\SysWOW64\rundll32.exe
    rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\gb7ir8nsaimu39b.dll,#1
    3⤵
    - Blocklisted process makes network request
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    PID:3824

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\mozila\logs.dat

Filesize
74B

MD5
96c878ab9a95c2ff97d7d071f32a0ee5

SHA1
eeccfd07686c3cffaa0a655ad6784cd318c37979

SHA256
f5606acfdd771c19b5e58f5caebce4a3abac2450e37941960b76cefc2bfb19a3

SHA512
a3c115f94f3d6ad8b5e53efc983a7948061238d14ecc1eb6228d377bee3784044804d4489774f7df62db36d9bdf0544d2287fe58d26125f22296fd831aac69be

Download Submit
memory/3824-1-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/3824-3-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/3824-5-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/3824-8-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/3824-9-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/3824-11-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/4964-0-0x0000000010000000-0x0000000010009000-memory.dmp

Filesize
36KB

Download
memory/4964-4-0x0000000010000000-0x0000000010009000-memory.dmp

Filesize
36KB

Download