remcos | 2d7ed09200c40b2f12d11415ea4f46e4b35b03d7e34b11e0e3339dc4e8ed687e

Analysis

max time kernel
150s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
19-03-2024 08:32

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General

Target

RFQ.vbs
Size

520KB
MD5

a32d581b0e933298fdad8007f0bc4f48
SHA1

9ee67035856075573f66028e4694a999e647d744
SHA256

2d7ed09200c40b2f12d11415ea4f46e4b35b03d7e34b11e0e3339dc4e8ed687e
SHA512

2da41cbd5eaf178db7cf6d20cac1cafcaca02d042d5661b719ff364831164fe894443bd6bfbf78db7baaa1fae3e70e3795fe74986dd81042f3e67cc50f62ead6
SSDEEP

12288:/2q1MBozZxA1VEWdNIb/1UYe0kagh//3PBLXgIe:TCBaQOWd81Uakzx/PBLXU

Score

10^/10

remcos remotehost collection rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

185.255.114.127:2404

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
false
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-E6UWII
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

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

Processes:

resource	yara_rule
behavioral2/memory/3100-49-0x0000000000400000-0x0000000000457000-memory.dmp	MailPassView
behavioral2/memory/3100-46-0x0000000000400000-0x0000000000457000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 2 IoCs

Password recovery tool for various web browsers

Processes:

resource	yara_rule
behavioral2/memory/1136-44-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/1136-61-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Nirsoft 6 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3320-48-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/3100-49-0x0000000000400000-0x0000000000457000-memory.dmp	Nirsoft
behavioral2/memory/3320-50-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/3100-46-0x0000000000400000-0x0000000000457000-memory.dmp	Nirsoft
behavioral2/memory/1136-44-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/1136-61-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

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-1-5-21-1904519900-954640453-4250331663-1000\Control Panel\International\Geo\Nation WScript.exe
Executes dropped EXE 1 IoCs

Processes:

payload.exe

pid process

3924 payload.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1904519900-954640453-4250331663-1000\Control Panel\International\Geo\Nation	WScript.exe

pid	process
3924	payload.exe

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

Processes:

Caspol.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-1904519900-954640453-4250331663-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	Caspol.exe

Suspicious use of SetThreadContext 4 IoCs

Processes:

payload.exeCaspol.exe

description	pid	process	target process
PID 3924 set thread context of 460	3924	payload.exe	Caspol.exe
PID 460 set thread context of 1136	460	Caspol.exe	Caspol.exe
PID 460 set thread context of 3100	460	Caspol.exe	Caspol.exe
PID 460 set thread context of 3320	460	Caspol.exe	Caspol.exe

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

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 6 IoCs

Processes:

Caspol.exeCaspol.exe

pid process

1136 Caspol.exe
1136 Caspol.exe
3320 Caspol.exe
3320 Caspol.exe
1136 Caspol.exe
1136 Caspol.exe
Suspicious behavior: MapViewOfSection 5 IoCs

Processes:

Caspol.exe

pid process

460 Caspol.exe
460 Caspol.exe
460 Caspol.exe
460 Caspol.exe
460 Caspol.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

Caspol.exe

description pid process

Token: SeDebugPrivilege 3320 Caspol.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Caspol.exe

pid process

460 Caspol.exe

pid	process
1136	Caspol.exe
1136	Caspol.exe
3320	Caspol.exe
3320	Caspol.exe
1136	Caspol.exe
1136	Caspol.exe

pid	process
460	Caspol.exe
460	Caspol.exe
460	Caspol.exe
460	Caspol.exe
460	Caspol.exe

description	pid	process
Token: SeDebugPrivilege	3320	Caspol.exe

pid	process
460	Caspol.exe

Suspicious use of WriteProcessMemory 33 IoCs

Processes:

WScript.exepayload.exeCaspol.exe

description	pid	process	target process
PID 2112 wrote to memory of 3924	2112	WScript.exe	payload.exe
PID 2112 wrote to memory of 3924	2112	WScript.exe	payload.exe
PID 2112 wrote to memory of 3924	2112	WScript.exe	payload.exe
PID 3924 wrote to memory of 460	3924	payload.exe	Caspol.exe
PID 3924 wrote to memory of 460	3924	payload.exe	Caspol.exe
PID 3924 wrote to memory of 460	3924	payload.exe	Caspol.exe
PID 3924 wrote to memory of 460	3924	payload.exe	Caspol.exe
PID 3924 wrote to memory of 460	3924	payload.exe	Caspol.exe
PID 3924 wrote to memory of 460	3924	payload.exe	Caspol.exe
PID 3924 wrote to memory of 460	3924	payload.exe	Caspol.exe
PID 3924 wrote to memory of 460	3924	payload.exe	Caspol.exe
PID 3924 wrote to memory of 460	3924	payload.exe	Caspol.exe
PID 3924 wrote to memory of 460	3924	payload.exe	Caspol.exe
PID 3924 wrote to memory of 460	3924	payload.exe	Caspol.exe
PID 3924 wrote to memory of 460	3924	payload.exe	Caspol.exe
PID 460 wrote to memory of 4832	460	Caspol.exe	Caspol.exe
PID 460 wrote to memory of 4832	460	Caspol.exe	Caspol.exe
PID 460 wrote to memory of 4832	460	Caspol.exe	Caspol.exe
PID 460 wrote to memory of 1136	460	Caspol.exe	Caspol.exe
PID 460 wrote to memory of 1136	460	Caspol.exe	Caspol.exe
PID 460 wrote to memory of 1136	460	Caspol.exe	Caspol.exe
PID 460 wrote to memory of 1136	460	Caspol.exe	Caspol.exe
PID 460 wrote to memory of 2884	460	Caspol.exe	Caspol.exe
PID 460 wrote to memory of 2884	460	Caspol.exe	Caspol.exe
PID 460 wrote to memory of 2884	460	Caspol.exe	Caspol.exe
PID 460 wrote to memory of 3100	460	Caspol.exe	Caspol.exe
PID 460 wrote to memory of 3100	460	Caspol.exe	Caspol.exe
PID 460 wrote to memory of 3100	460	Caspol.exe	Caspol.exe
PID 460 wrote to memory of 3100	460	Caspol.exe	Caspol.exe
PID 460 wrote to memory of 3320	460	Caspol.exe	Caspol.exe
PID 460 wrote to memory of 3320	460	Caspol.exe	Caspol.exe
PID 460 wrote to memory of 3320	460	Caspol.exe	Caspol.exe
PID 460 wrote to memory of 3320	460	Caspol.exe	Caspol.exe

C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\RFQ.vbs"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2112

C:\Users\Admin\AppData\Local\Temp\payload.exe
"C:\Users\Admin\AppData\Local\Temp\payload.exe"
2⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3924

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe"
3⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:460

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe /stext "C:\Users\Admin\AppData\Local\Temp\rxbn"
4⤵
PID:4832

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe /stext "C:\Users\Admin\AppData\Local\Temp\rxbn"
4⤵
- Suspicious behavior: EnumeratesProcesses
PID:1136

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe /stext "C:\Users\Admin\AppData\Local\Temp\brhgnur"
4⤵
PID:2884

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe /stext "C:\Users\Admin\AppData\Local\Temp\brhgnur"
4⤵
- Accesses Microsoft Outlook accounts
PID:3100

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe /stext "C:\Users\Admin\AppData\Local\Temp\dumqombcqlm"
4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3320

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=3936 --field-trial-handle=2260,i,9938964625802268469,1928462186077019554,262144 --variations-seed-version /prefetch:8
1⤵
PID:3444

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\remcos\logs.dat

Filesize
144B

MD5
7609415dacde3211f371021fe331f673

SHA1
0ebf9c96ebf95063ecb56c3b3dd7ef5b5a909d61

SHA256
f7ef1050034baa1f9f45c8d3d99619c9950fefb1da972c69cfec8f9cac392dc4

SHA512
0894cac711f7494bae5e2ffb771ba11d8e8ac17bd07fe97d6ffb719fe4e07966e36aa7403d66d7e3bfb1b5c94d7c0ba196e6bacde9a0f7ca598ed2d08ba7b0c0

Download Submit
C:\Users\Admin\AppData\Local\Temp\payload.exe

Filesize
389KB

MD5
8c0877c86b2e9d59b74c245c620de3f3

SHA1
376b29b5166a8f4b9819e5ed298a801af83e03f9

SHA256
2fbab4885cb8c8b53e5afba167f6a7a14293cd2795f198c1435371f2b4f2c3a8

SHA512
804db8402855a8628b8744beb4ae562f2da94b3fb7fcf58b0614d741aa4c2460b2f2373f783407c80de03bd098506cfec2aec8b6d4624c2422616592b69ff7a9

Download Submit
C:\Users\Admin\AppData\Local\Temp\rxbn

Filesize
4KB

MD5
32100ea472bc470ba10f60a11c782c0e

SHA1
078aa6214b8ca1c3562774453abca6c8806a13c3

SHA256
d6132e01d239dbbe0f686e1a18cd57d7cf272e34ab03b7f483f5147c00d374ad

SHA512
df7aaa762f5546a9e783b5a15a9cd5a3e66ec43b5502b025d621f106e63008095461a96d5f1f06791cac6322e0c418eb6de476b6856338e2f5fc2d038ca10d6b

Download Submit
memory/460-68-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/460-92-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-109-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-108-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-101-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-18-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-19-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-100-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-21-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-23-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-24-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-26-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-27-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-28-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-93-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-30-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-32-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-35-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-85-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-84-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-77-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-76-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-29-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-74-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-67-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/460-70-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/460-69-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/460-63-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/1136-61-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1136-42-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1136-44-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1136-34-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/3100-41-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/3100-37-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/3100-49-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/3100-46-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/3320-50-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/3320-45-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/3320-48-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/3320-39-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/3924-14-0x0000000007F00000-0x00000000084A4000-memory.dmp

Filesize
5.6MB

Download
memory/3924-13-0x00000000078E0000-0x0000000007946000-memory.dmp

Filesize
408KB

Download
memory/3924-11-0x0000000000AB0000-0x0000000000B16000-memory.dmp

Filesize
408KB

Download
memory/3924-12-0x0000000074EB0000-0x0000000075660000-memory.dmp

Filesize
7.7MB

Download
memory/3924-22-0x0000000074EB0000-0x0000000075660000-memory.dmp

Filesize
7.7MB

Download
memory/3924-17-0x0000000002E20000-0x0000000002E2A000-memory.dmp

Filesize
40KB

Download
memory/3924-16-0x00000000053F0000-0x0000000005400000-memory.dmp

Filesize
64KB

Download
memory/3924-15-0x0000000007A50000-0x0000000007AE2000-memory.dmp

Filesize
584KB

Download