remcos | dfc7f8d0f59dc66f78fffea0b999a2a662057edbc39a836de95884147464f643

General

Target

Ton-Keep purchase order_pdf.exe
Size

461KB
MD5

eaa3035b2314bfba3c2a110d8a43b5be
SHA1

6953afddd00c760525ea91c376b1d5205164841f
SHA256

67163c34b396f7fc4a1dec14c1a0e598d5ac5786e6c26f11c8b8b16b31b70f4c
SHA512

79e38dc75a67c886463cbd0b924973a409973ad68fe1968c84fe47766854399347aff59b96fb9a099abb802cbb6c5c8ed76eb68b1a9ce753a74cbf2671e90148

Score

10^/10

remcos xxxtew evasion rat

Malware Config

Extracted

Family

remcos

Version

2.7.0 Pro

Botnet

xxxtew

C2

194.5.97.70:2404

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
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%AppData%
mouse_option
false
mutex
xxxtew-J74IDK
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:

Ton-Keep purchase order_pdf.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	Ton-Keep purchase order_pdf.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	Ton-Keep purchase order_pdf.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:

Ton-Keep purchase order_pdf.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1081944012-3634099177-1681222835-1000\Control Panel\International\Geo\Nation	Ton-Keep purchase order_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:

Ton-Keep purchase order_pdf.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	Ton-Keep purchase order_pdf.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	Ton-Keep purchase order_pdf.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

Ton-Keep purchase order_pdf.exe

description pid process target process

PID 2612 set thread context of 4512 2612 Ton-Keep purchase order_pdf.exe Ton-Keep purchase order_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

1068 schtasks.exe

description	pid	process	target process
PID 2612 set thread context of 4512	2612	Ton-Keep purchase order_pdf.exe	Ton-Keep purchase order_pdf.exe

pid	process
1068	schtasks.exe

Suspicious use of WriteProcessMemory 13 IoCs

Processes:

Ton-Keep purchase order_pdf.exe

description	pid	process	target process
PID 2612 wrote to memory of 1068	2612	Ton-Keep purchase order_pdf.exe	schtasks.exe
PID 2612 wrote to memory of 1068	2612	Ton-Keep purchase order_pdf.exe	schtasks.exe
PID 2612 wrote to memory of 1068	2612	Ton-Keep purchase order_pdf.exe	schtasks.exe
PID 2612 wrote to memory of 4512	2612	Ton-Keep purchase order_pdf.exe	Ton-Keep purchase order_pdf.exe
PID 2612 wrote to memory of 4512	2612	Ton-Keep purchase order_pdf.exe	Ton-Keep purchase order_pdf.exe
PID 2612 wrote to memory of 4512	2612	Ton-Keep purchase order_pdf.exe	Ton-Keep purchase order_pdf.exe
PID 2612 wrote to memory of 4512	2612	Ton-Keep purchase order_pdf.exe	Ton-Keep purchase order_pdf.exe
PID 2612 wrote to memory of 4512	2612	Ton-Keep purchase order_pdf.exe	Ton-Keep purchase order_pdf.exe
PID 2612 wrote to memory of 4512	2612	Ton-Keep purchase order_pdf.exe	Ton-Keep purchase order_pdf.exe
PID 2612 wrote to memory of 4512	2612	Ton-Keep purchase order_pdf.exe	Ton-Keep purchase order_pdf.exe
PID 2612 wrote to memory of 4512	2612	Ton-Keep purchase order_pdf.exe	Ton-Keep purchase order_pdf.exe
PID 2612 wrote to memory of 4512	2612	Ton-Keep purchase order_pdf.exe	Ton-Keep purchase order_pdf.exe
PID 2612 wrote to memory of 4512	2612	Ton-Keep purchase order_pdf.exe	Ton-Keep purchase order_pdf.exe

C:\Users\Admin\AppData\Local\Temp\Ton-Keep purchase order_pdf.exe
"C:\Users\Admin\AppData\Local\Temp\Ton-Keep purchase order_pdf.exe"
1⤵
- Checks BIOS information in registry
- Checks computer location settings
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2612

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\WyfLTKwIGXwba" /XML "C:\Users\Admin\AppData\Local\Temp\tmpFE46.tmp"
2⤵
- Creates scheduled task(s)
PID:1068

C:\Users\Admin\AppData\Local\Temp\Ton-Keep purchase order_pdf.exe
"C:\Users\Admin\AppData\Local\Temp\Ton-Keep purchase order_pdf.exe"
2⤵
PID:4512

Network

MITRE ATT&CK Enterprise 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

Peripheral Device Discovery

Query Registry

System Information Discovery

4

T1082

Virtualization/Sandbox Evasion

2

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpFE46.tmp

Filesize
1KB

MD5
785d9a2aa6908e318bae8e23f7a06bd1

SHA1
758aaa8ab098688ce6103101ed38f008036af94f

SHA256
15c10f782b18c287003644c088e87e3dcf47ea95eb0fd9e7c1a30275bc48a567

SHA512
bd8688416a5e6b6abebcefbd69fcc7277a8c942f94947d56862a98483496020cdf26e9046d5673ce9721e9d065d3dfaca8faf2a641d4eb18ff7b2fbf2e113547

Download Submit
memory/1068-137-0x0000000000000000-mapping.dmp

Download
memory/2612-136-0x0000000006380000-0x00000000063E6000-memory.dmp

Filesize
408KB

Download
memory/2612-133-0x0000000005650000-0x00000000056E2000-memory.dmp

Filesize
584KB

Download
memory/2612-134-0x0000000005590000-0x000000000559A000-memory.dmp

Filesize
40KB

Download
memory/2612-135-0x00000000056F0000-0x0000000005746000-memory.dmp

Filesize
344KB

Download
memory/2612-130-0x0000000000AE0000-0x0000000000B5A000-memory.dmp

Filesize
488KB

Download
memory/2612-132-0x0000000005B60000-0x0000000006104000-memory.dmp

Filesize
5.6MB

Download
memory/2612-131-0x00000000054F0000-0x000000000558C000-memory.dmp

Filesize
624KB

Download
memory/4512-139-0x0000000000000000-mapping.dmp

Download
memory/4512-140-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/4512-142-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/4512-143-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads