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

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 1984 set thread context of 1044 1984 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

1552 schtasks.exe
Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

Ton-Keep purchase order_pdf.exe

pid process

1984 Ton-Keep purchase order_pdf.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

Ton-Keep purchase order_pdf.exe

description pid process

Token: SeDebugPrivilege 1984 Ton-Keep purchase order_pdf.exe

description	pid	process	target process
PID 1984 set thread context of 1044	1984	Ton-Keep purchase order_pdf.exe	Ton-Keep purchase order_pdf.exe

pid	process
1552	schtasks.exe

pid	process
1984	Ton-Keep purchase order_pdf.exe

description	pid	process
Token: SeDebugPrivilege	1984	Ton-Keep purchase order_pdf.exe

Suspicious use of WriteProcessMemory 15 IoCs

Processes:

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
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1984

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\WyfLTKwIGXwba" /XML "C:\Users\Admin\AppData\Local\Temp\tmp70ED.tmp"
2⤵
- Creates scheduled task(s)
PID:1552

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:1044

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\tmp70ED.tmp
Filesize
1KB

MD5
8d3f3c1eda90e8b81dcb37a4c6c67973

SHA1
d6be9b8a461e216e06f11a923e3daac16fc0e180

SHA256
5aea71831de5977bc5882b9a538a085c95f9bff8748f2df71598bf5f4702cd36

SHA512
831c21f6298a4179a129cb85949a08d0fe4cb9f079870e33f58e12296d0585883e5ff68d6c588f90b1edb18f2a5f93f79a378e3a2598ca1d637e170043ad4fb4

Download Submit
memory/1044-68-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1044-61-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1044-75-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1044-74-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1044-64-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1044-71-0x0000000000413E54-mapping.dmp

Download
memory/1044-70-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1044-62-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1044-67-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1044-66-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1552-59-0x0000000000000000-mapping.dmp

Download
memory/1984-54-0x0000000000A40000-0x0000000000ABA000-memory.dmp

Filesize
488KB

Download
memory/1984-56-0x0000000000440000-0x0000000000448000-memory.dmp

Filesize
32KB

Download
memory/1984-55-0x00000000756E1000-0x00000000756E3000-memory.dmp

Filesize
8KB

Download
memory/1984-58-0x0000000000830000-0x0000000000866000-memory.dmp

Filesize
216KB

Download
memory/1984-57-0x0000000004E90000-0x0000000004EEC000-memory.dmp

Filesize
368KB

Download

description	pid	process	target process
PID 1984 wrote to memory of 1552	1984	Ton-Keep purchase order_pdf.exe	schtasks.exe
PID 1984 wrote to memory of 1552	1984	Ton-Keep purchase order_pdf.exe	schtasks.exe
PID 1984 wrote to memory of 1552	1984	Ton-Keep purchase order_pdf.exe	schtasks.exe
PID 1984 wrote to memory of 1552	1984	Ton-Keep purchase order_pdf.exe	schtasks.exe
PID 1984 wrote to memory of 1044	1984	Ton-Keep purchase order_pdf.exe	Ton-Keep purchase order_pdf.exe
PID 1984 wrote to memory of 1044	1984	Ton-Keep purchase order_pdf.exe	Ton-Keep purchase order_pdf.exe
PID 1984 wrote to memory of 1044	1984	Ton-Keep purchase order_pdf.exe	Ton-Keep purchase order_pdf.exe
PID 1984 wrote to memory of 1044	1984	Ton-Keep purchase order_pdf.exe	Ton-Keep purchase order_pdf.exe
PID 1984 wrote to memory of 1044	1984	Ton-Keep purchase order_pdf.exe	Ton-Keep purchase order_pdf.exe
PID 1984 wrote to memory of 1044	1984	Ton-Keep purchase order_pdf.exe	Ton-Keep purchase order_pdf.exe
PID 1984 wrote to memory of 1044	1984	Ton-Keep purchase order_pdf.exe	Ton-Keep purchase order_pdf.exe
PID 1984 wrote to memory of 1044	1984	Ton-Keep purchase order_pdf.exe	Ton-Keep purchase order_pdf.exe
PID 1984 wrote to memory of 1044	1984	Ton-Keep purchase order_pdf.exe	Ton-Keep purchase order_pdf.exe
PID 1984 wrote to memory of 1044	1984	Ton-Keep purchase order_pdf.exe	Ton-Keep purchase order_pdf.exe
PID 1984 wrote to memory of 1044	1984	Ton-Keep purchase order_pdf.exe	Ton-Keep purchase order_pdf.exe

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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