remcos | dc8123dcee063dc91f1e4b66c5d2ba74c5840254aae98e096b8cae1da3be5a2a

Analysis

max time kernel
93s
max time network
147s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
09-12-2024 19:18

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General

Target

CiscoSparkLauncher.dll
Size

2.6MB
MD5

e2e01305e938ea378a88658d81c0917f
SHA1

6b3dc7e13347f6fadadc2dbac7d3a3927d9e2aa6
SHA256

29c3c48f4dc84e7179881bc3767546878b2db89d418372f687edbd4a72ef0989
SHA512

5620ea58d2a7da0fe5d352ea1fe82e76ed84c31b2ae97b28a3ab3b25268f21c0a8eef8ca7baa05ab0f2c80a8125fc7e2441065eda11259b1f636be7b3d6c202d
SSDEEP

49152:aGtlqOIU6iJVwASOcO81WPz3qjFr6t1Dt+w+PpmtsHcFhKgwzfQHdPWkpRs6:m+18rcDINHAhKQH8S

Score

10^/10

remcos mellis discovery rat

Malware Config

Extracted

Family

remcos

Botnet

mellis

melloreservas.kozow.com:5353

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
Rmc-OX0E5C
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-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2604	svchost.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	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000_Classes\Local Settings	svchost.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
2160	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe
4912	rundll32.exe

Suspicious behavior: LoadsDriver 2 IoCs

pid	Process
656	Process not Found
656	Process not Found

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4912 wrote to memory of 3552	4912	rundll32.exe	85
PID 4912 wrote to memory of 3552	4912	rundll32.exe	85
PID 3552 wrote to memory of 2160	3552	cmd.exe	87
PID 3552 wrote to memory of 2160	3552	cmd.exe	87
PID 4912 wrote to memory of 2604	4912	rundll32.exe	88
PID 4912 wrote to memory of 2604	4912	rundll32.exe	88
PID 4912 wrote to memory of 2604	4912	rundll32.exe	88
PID 2604 wrote to memory of 1320	2604	svchost.exe	98
PID 2604 wrote to memory of 1320	2604	svchost.exe	98
PID 2604 wrote to memory of 1320	2604	svchost.exe	98

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\CiscoSparkLauncher.dll,#1
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4912
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c schtasks /create /tn "l1TC0x" /tr "C:\Users\Admin\AppData\Roaming\rundll32.exe" /sc onlogon /rl highest /f
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3552
- - C:\Windows\system32\schtasks.exe
    schtasks /create /tn "l1TC0x" /tr "C:\Users\Admin\AppData\Roaming\rundll32.exe" /sc onlogon /rl highest /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2160
- C:\Users\Admin\AppData\Local\Temp\svchost.exe
  "C:\Users\Admin\AppData\Local\Temp\svchost.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:2604
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\ujthfeisvcfjvtbo.vbs"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:1320

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

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\Local\Temp\svchost.exe

Filesize
481KB

MD5
a30283c01840f1a26afe40ae0b576bf8

SHA1
f4568fda687c1720b80ff07a12b38f8d1d6af33c

SHA256
e2a4a7e147898dc2d01f1b4d2892000395f5e43770a25ecdb170bb185ac0477a

SHA512
8fc5de3c634032f57cebf8f7967ecca0952a37e5c949f34cc208f7734a6162e8276699de1b4501ba196170468b4ef472002db09dc3fcee072e66ff3477a24c54

Download Submit
C:\Users\Admin\AppData\Local\Temp\ujthfeisvcfjvtbo.vbs

Filesize
500B

MD5
f1da013fa58295ac94372331e618f047

SHA1
b52f602bca7d2b9a04a55be4a1a4de857c98cbdb

SHA256
01df7d7ec8acb49f038a93cf1aeb9a79ddda138fa38992f477e6448689c09cd9

SHA512
fc1cfb5f09b5d96958d9387f582629e6691e996890ea345466fc47e214be074c9c625f3fb7f4e86d7e5b9864edcfe0d40031e6a0d6c496c5427d21bcffba26a8

Download Submit
memory/4912-0-0x0000000000400000-0x0000000000A22000-memory.dmp

Filesize
6.1MB

Download
memory/4912-19-0x0000000068840000-0x0000000068F29000-memory.dmp

Filesize
6.9MB

Download