remcos | 602a23db79b166b648550c4c45246a3f2664d3bc4b1cc771bd51e6ee1df125f6

General

Target

Request for Quotation Export-DH772_24042020.exe
Size

288KB
MD5

6188c89247429b47bf080fba75b26c5d
SHA1

cd1d1c1de2f841e41324667d069d228c538fe1cb
SHA256

cc7c88bb23e3dc2b7de49f259704692ff36fb9dd7b3c307710034229b263e0fc
SHA512

9290f0546b9942c5af81804e1f302cd7e696403ad2a3a32ef24c6dc1b649b55fae78e5581b283a0a59bbc7388dbf635387fd63f4f590893f16e4cc8099e716c8

Score

10^/10

remcos remotehost coreentity rat rezer0

Malware Config

Extracted

Family

remcos

Version

2.5.0 Pro

Botnet

RemoteHost

C2

dolxxrem.hopto.org:3086

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
Remcos-B3XNCF
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

CoreEntity .NET Packer 1 IoCs

A .NET packer called CoreEntity where it has embedded the payload as a BitMap object which is later decrypted.

coreentity

Processes:

resource	yara_rule
behavioral1/memory/1980-56-0x0000000000600000-0x0000000000608000-memory.dmp	coreentity

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos

ReZer0 packer 1 IoCs

Detects ReZer0, a packer with multiple versions used in various campaigns.

rezer0

Processes:

resource	yara_rule
behavioral1/memory/1980-57-0x0000000000BB0000-0x0000000000BDC000-memory.dmp	rezer0

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064
Suspicious use of SetThreadContext 1 IoCs

Processes:

Request for Quotation Export-DH772_24042020.exe

description pid process target process

PID 1980 set thread context of 992 1980 Request for Quotation Export-DH772_24042020.exe vbc.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

844 schtasks.exe

description	pid	process	target process
PID 1980 set thread context of 992	1980	Request for Quotation Export-DH772_24042020.exe	vbc.exe

pid	process
844	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

Processes:

Request for Quotation Export-DH772_24042020.exe

pid	process
1980	Request for Quotation Export-DH772_24042020.exe
1980	Request for Quotation Export-DH772_24042020.exe
1980	Request for Quotation Export-DH772_24042020.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

Request for Quotation Export-DH772_24042020.exe

description pid process

Token: SeDebugPrivilege 1980 Request for Quotation Export-DH772_24042020.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

vbc.exe

pid process

992 vbc.exe

description	pid	process
Token: SeDebugPrivilege	1980	Request for Quotation Export-DH772_24042020.exe

pid	process
992	vbc.exe

Suspicious use of WriteProcessMemory 15 IoCs

Processes:

Request for Quotation Export-DH772_24042020.exe

description	pid	process	target process
PID 1980 wrote to memory of 844	1980	Request for Quotation Export-DH772_24042020.exe	schtasks.exe
PID 1980 wrote to memory of 844	1980	Request for Quotation Export-DH772_24042020.exe	schtasks.exe
PID 1980 wrote to memory of 844	1980	Request for Quotation Export-DH772_24042020.exe	schtasks.exe
PID 1980 wrote to memory of 844	1980	Request for Quotation Export-DH772_24042020.exe	schtasks.exe
PID 1980 wrote to memory of 992	1980	Request for Quotation Export-DH772_24042020.exe	vbc.exe
PID 1980 wrote to memory of 992	1980	Request for Quotation Export-DH772_24042020.exe	vbc.exe
PID 1980 wrote to memory of 992	1980	Request for Quotation Export-DH772_24042020.exe	vbc.exe
PID 1980 wrote to memory of 992	1980	Request for Quotation Export-DH772_24042020.exe	vbc.exe
PID 1980 wrote to memory of 992	1980	Request for Quotation Export-DH772_24042020.exe	vbc.exe
PID 1980 wrote to memory of 992	1980	Request for Quotation Export-DH772_24042020.exe	vbc.exe
PID 1980 wrote to memory of 992	1980	Request for Quotation Export-DH772_24042020.exe	vbc.exe
PID 1980 wrote to memory of 992	1980	Request for Quotation Export-DH772_24042020.exe	vbc.exe
PID 1980 wrote to memory of 992	1980	Request for Quotation Export-DH772_24042020.exe	vbc.exe
PID 1980 wrote to memory of 992	1980	Request for Quotation Export-DH772_24042020.exe	vbc.exe
PID 1980 wrote to memory of 992	1980	Request for Quotation Export-DH772_24042020.exe	vbc.exe

C:\Users\Admin\AppData\Local\Temp\Request for Quotation Export-DH772_24042020.exe
"C:\Users\Admin\AppData\Local\Temp\Request for Quotation Export-DH772_24042020.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1980

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\IvZFaSiztUzjgF" /XML "C:\Users\Admin\AppData\Local\Temp\tmp3479.tmp"
2⤵
- Creates scheduled task(s)
PID:844

C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
"{path}"
2⤵
- Suspicious use of SetWindowsHookEx
PID:992

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scripting

1

T1064

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Scripting

1

T1064

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp3479.tmp
Filesize
1KB

MD5
b9e6c95377b180dccb694d6b0dd11f7f

SHA1
af901aca06003325a1f09b4721446666c9db2a5a

SHA256
27c918b226da833f36f5ef1b265ddede5e65cf4cf004318b55a0e131d761a303

SHA512
18b4146348231cc8d14392a400e8f6f0b9a51468143d33c80f8202b6f1ff7f4930c21e51cb47e97578266a6b04af86842496bbc37790fcd1b10d5c8f89a18c40

Download Submit
memory/844-58-0x0000000000000000-mapping.dmp

Download
memory/992-63-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/992-65-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/992-74-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/992-73-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/992-60-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/992-61-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/992-70-0x0000000000413A84-mapping.dmp

Download
memory/992-69-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/992-66-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/992-67-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/1980-57-0x0000000000BB0000-0x0000000000BDC000-memory.dmp

Filesize
176KB

Download
memory/1980-54-0x0000000000DC0000-0x0000000000E0E000-memory.dmp

Filesize
312KB

Download
memory/1980-55-0x00000000768D1000-0x00000000768D3000-memory.dmp

Filesize
8KB

Download
memory/1980-56-0x0000000000600000-0x0000000000608000-memory.dmp

Filesize
32KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

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Downloads