remcos | cbbb702f3317d7c2e99e511e7e48939c724423b5e38a15612d91864a70a3e707

Analysis

max time kernel
255s
max time network
326s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
29-11-2022 12:44

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General

Target

fbd46ea22af9ed39fbbd66a1c6ac9cc4.js
Size

850KB
MD5

e6bd21e0286aa3155c31cc7283338b91
SHA1

a4a3e1b22e3b28aee3fa3c2ec42e20c17c564430
SHA256

cbbb702f3317d7c2e99e511e7e48939c724423b5e38a15612d91864a70a3e707
SHA512

ad79732bcce4dd262509f0550fad32e840c2e07d90f5daae835b3b24994ec9acd2d3a1196316cd1714d5e266c985ced287ea469356239271b3365045fc4d2dad
SSDEEP

12288:KxUjeXvsDRhdpT0O+FT9524AKKBTncFPpw8xnMymrJN:X9MJf2nGPwrJN

Score

10^/10

remcos vjw0rm remotehost persistence rat trojan worm

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

45.139.105.174:3111

Attributes

audio_folder
MicRecords
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
true
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-XI5CH7
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
Remcos
take_screenshot_option
false
take_screenshot_time
5

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Vjw0rm
Vjw0rm is a remote access trojan written in JavaScript.
trojan worm vjw0rm
Executes dropped EXE 1 IoCs

Processes:

3am.exe

pid process

1028 3am.exe
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

Processes:

wscript.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000\Control Panel\International\Geo\Nation wscript.exe

pid	process
1028	3am.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000\Control Panel\International\Geo\Nation	wscript.exe

Drops startup file 2 IoCs

Processes:

wscript.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\UFeEEKYjMt.js	wscript.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\UFeEEKYjMt.js	wscript.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

3am.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000\Software\Microsoft\Windows\CurrentVersion\Run\	3am.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	3am.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\	3am.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\ProgramData\\Remcos\\remcos.exe\""	3am.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 5 IoCs

Processes:

wscript.exe

description	pid	process	target process
PID 4864 wrote to memory of 3112	4864	wscript.exe	wscript.exe
PID 4864 wrote to memory of 3112	4864	wscript.exe	wscript.exe
PID 4864 wrote to memory of 1028	4864	wscript.exe	3am.exe
PID 4864 wrote to memory of 1028	4864	wscript.exe	3am.exe
PID 4864 wrote to memory of 1028	4864	wscript.exe	3am.exe

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\fbd46ea22af9ed39fbbd66a1c6ac9cc4.js
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4864

C:\Windows\System32\wscript.exe
"C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\UFeEEKYjMt.js"
2⤵
- Drops startup file
PID:3112

C:\Users\Admin\AppData\Roaming\3am.exe
"C:\Users\Admin\AppData\Roaming\3am.exe"
2⤵
- Executes dropped EXE
- Adds Run key to start application
PID:1028

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\3am.exe
Filesize
470KB

MD5
8f6f561ec65b393126f5b648f890e78a

SHA1
cea6ff88ba56fcfdcf5992b5b35ec2accbd234a3

SHA256
8acb8ff6a5565f9d8b56e2712858db04e577c53906c8045fa43bdf1e7669120a

SHA512
58e2544db5c4a9771d3cfef8364e80f4b0fb954f7ace2585fbb619d5b9de641eaac6956127d61d5808874633033d3c6d4322fb250a47a7dce5a3c8f2e7f8b27b

Download Submit
C:\Users\Admin\AppData\Roaming\3am.exe
Filesize
470KB

MD5
8f6f561ec65b393126f5b648f890e78a

SHA1
cea6ff88ba56fcfdcf5992b5b35ec2accbd234a3

SHA256
8acb8ff6a5565f9d8b56e2712858db04e577c53906c8045fa43bdf1e7669120a

SHA512
58e2544db5c4a9771d3cfef8364e80f4b0fb954f7ace2585fbb619d5b9de641eaac6956127d61d5808874633033d3c6d4322fb250a47a7dce5a3c8f2e7f8b27b

Download Submit
C:\Users\Admin\AppData\Roaming\UFeEEKYjMt.js
Filesize
5KB

MD5
7939b202fdfc11113b2e056609a5681a

SHA1
ec68ff182bc21439e8c62d3678a36a097cdc0856

SHA256
c7640f4cd18be6d75f6b01f71bcbe92343084d24759f4bce2b5eaff91e001ef5

SHA512
bc75eea4367594c715f1e842368989791c445110b8a9eb295681810b4917604baca3314083796c5f6da7117bfba109ee6dde7e7ccd526101081b0e5f86c21681

Download Submit
memory/1028-134-0x0000000000000000-mapping.dmp

Download
memory/3112-132-0x0000000000000000-mapping.dmp

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