remcos | b371d002c5cdc04dc83f47d413a17103d6325b13c945ff090952aa743b6e9205

General

Target

PO93-DOC89345833_pdf.exe
Size

241KB
MD5

d44fd12c4a59244c15415cc69d9107b2
SHA1

6a656dd83746eab439e5945c262f96b3cdce15ec
SHA256

1f116c8f89973d9a9641d0dfd79af6c83c36ea2bf80a7cde67c18613402a1936
SHA512

a8fffbf3fab2e479a20f544dc35f9c560793d6936a1a975a3aba68153c3d958b3963d5c87053b763de28a41d3cf04cbdb78e085001fa148234cc87f7d092253e

Score

10^/10

remcos xxxxxxxxxxxx evasion rat

Malware Config

Extracted

Family

remcos

Version

2.5.1 Pro

Botnet

xxxxxxxxxxxx

C2

109.169.89.116:2021

Attributes

audio_folder
MicRecords
audio_path
%AppData%
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
install_path
%AppData%
keylog_crypt
false
keylog_file
s.sex
keylog_flag
false
keylog_folder
ssssss
keylog_path
%UserProfile%
mouse_option
false
mutex
fuckhere-M9W1LK
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
take_screenshot_title
wikipedia;solitaire;

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Looks for VirtualBox Guest Additions in registry 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497
Looks for VMWare Tools registry key 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

Processes:

PO93-DOC89345833_pdf.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	PO93-DOC89345833_pdf.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	PO93-DOC89345833_pdf.exe

Maps connected drives based on registry 3 TTPs 2 IoCs

Disk information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

Processes:

PO93-DOC89345833_pdf.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	PO93-DOC89345833_pdf.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	PO93-DOC89345833_pdf.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

PO93-DOC89345833_pdf.exe

description pid process target process

PID 1704 set thread context of 1712 1704 PO93-DOC89345833_pdf.exe PO93-DOC89345833_pdf.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

schtasks.exe

pid process

900 schtasks.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

PO93-DOC89345833_pdf.exe

pid process

1704 PO93-DOC89345833_pdf.exe
1704 PO93-DOC89345833_pdf.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

PO93-DOC89345833_pdf.exe

description pid process

Token: SeDebugPrivilege 1704 PO93-DOC89345833_pdf.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

PO93-DOC89345833_pdf.exe

pid process

1712 PO93-DOC89345833_pdf.exe

description	pid	process	target process
PID 1704 set thread context of 1712	1704	PO93-DOC89345833_pdf.exe	PO93-DOC89345833_pdf.exe

pid	process
900	schtasks.exe

pid	process
1704	PO93-DOC89345833_pdf.exe
1704	PO93-DOC89345833_pdf.exe

description	pid	process
Token: SeDebugPrivilege	1704	PO93-DOC89345833_pdf.exe

pid	process
1712	PO93-DOC89345833_pdf.exe

Suspicious use of WriteProcessMemory 19 IoCs

Processes:

PO93-DOC89345833_pdf.exe

description	pid	process	target process
PID 1704 wrote to memory of 900	1704	PO93-DOC89345833_pdf.exe	schtasks.exe
PID 1704 wrote to memory of 900	1704	PO93-DOC89345833_pdf.exe	schtasks.exe
PID 1704 wrote to memory of 900	1704	PO93-DOC89345833_pdf.exe	schtasks.exe
PID 1704 wrote to memory of 900	1704	PO93-DOC89345833_pdf.exe	schtasks.exe
PID 1704 wrote to memory of 812	1704	PO93-DOC89345833_pdf.exe	PO93-DOC89345833_pdf.exe
PID 1704 wrote to memory of 812	1704	PO93-DOC89345833_pdf.exe	PO93-DOC89345833_pdf.exe
PID 1704 wrote to memory of 812	1704	PO93-DOC89345833_pdf.exe	PO93-DOC89345833_pdf.exe
PID 1704 wrote to memory of 812	1704	PO93-DOC89345833_pdf.exe	PO93-DOC89345833_pdf.exe
PID 1704 wrote to memory of 1712	1704	PO93-DOC89345833_pdf.exe	PO93-DOC89345833_pdf.exe
PID 1704 wrote to memory of 1712	1704	PO93-DOC89345833_pdf.exe	PO93-DOC89345833_pdf.exe
PID 1704 wrote to memory of 1712	1704	PO93-DOC89345833_pdf.exe	PO93-DOC89345833_pdf.exe
PID 1704 wrote to memory of 1712	1704	PO93-DOC89345833_pdf.exe	PO93-DOC89345833_pdf.exe
PID 1704 wrote to memory of 1712	1704	PO93-DOC89345833_pdf.exe	PO93-DOC89345833_pdf.exe
PID 1704 wrote to memory of 1712	1704	PO93-DOC89345833_pdf.exe	PO93-DOC89345833_pdf.exe
PID 1704 wrote to memory of 1712	1704	PO93-DOC89345833_pdf.exe	PO93-DOC89345833_pdf.exe
PID 1704 wrote to memory of 1712	1704	PO93-DOC89345833_pdf.exe	PO93-DOC89345833_pdf.exe
PID 1704 wrote to memory of 1712	1704	PO93-DOC89345833_pdf.exe	PO93-DOC89345833_pdf.exe
PID 1704 wrote to memory of 1712	1704	PO93-DOC89345833_pdf.exe	PO93-DOC89345833_pdf.exe
PID 1704 wrote to memory of 1712	1704	PO93-DOC89345833_pdf.exe	PO93-DOC89345833_pdf.exe

C:\Users\Admin\AppData\Local\Temp\PO93-DOC89345833_pdf.exe
"C:\Users\Admin\AppData\Local\Temp\PO93-DOC89345833_pdf.exe"
1⤵
- Checks BIOS information in registry
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1704

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\hFcQDCaVIsyKP" /XML "C:\Users\Admin\AppData\Local\Temp\tmpD72E.tmp"
2⤵
- Creates scheduled task(s)
PID:900

C:\Users\Admin\AppData\Local\Temp\PO93-DOC89345833_pdf.exe
"C:\Users\Admin\AppData\Local\Temp\PO93-DOC89345833_pdf.exe"
2⤵
PID:812

C:\Users\Admin\AppData\Local\Temp\PO93-DOC89345833_pdf.exe
"C:\Users\Admin\AppData\Local\Temp\PO93-DOC89345833_pdf.exe"
2⤵
- Suspicious use of SetWindowsHookEx
PID:1712

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Virtualization/Sandbox Evasion

2

T1497

Credential Access

Discovery

Query Registry

4

T1012

Virtualization/Sandbox Evasion

2

T1497

System Information Discovery

3

T1082

Peripheral Device Discovery

1

T1120

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpD72E.tmp
Filesize
1KB

MD5
cc42a3377336a66d1f073a23b3f8f4f9

SHA1
28f21e0ea55d1b2d7587dc63fe55369532d19723

SHA256
a7d8b43ba422732ac6241e6b37483b22d42d73fe1ca110701dab130218f2242a

SHA512
8cc95409828dacd46efe2fc3b53017b6b59316c1a167f5ce0d8777e03c6248a751659df77e9c91fe1489fdc233e4f1d631ca168cc2059d6756fa9b6af151da4e

Download Submit
memory/900-58-0x0000000000000000-mapping.dmp

Download
memory/1704-54-0x0000000000AD0000-0x0000000000B12000-memory.dmp

Filesize
264KB

Download
memory/1704-55-0x00000000755B1000-0x00000000755B3000-memory.dmp

Filesize
8KB

Download
memory/1704-56-0x0000000000490000-0x0000000000498000-memory.dmp

Filesize
32KB

Download
memory/1704-57-0x0000000004360000-0x000000000438E000-memory.dmp

Filesize
184KB

Download
memory/1712-63-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/1712-61-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/1712-60-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/1712-65-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/1712-66-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/1712-67-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/1712-70-0x0000000000413B74-mapping.dmp

Download
memory/1712-69-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/1712-73-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/1712-74-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads