Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 af0931ecfcdeefd9…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:47 Authoring application: Microsoft Excel First seen: 2021-09-27
MD5: 7f5ca36e75626012b7acf4650b02ff4c SHA-1: 769a56f712e0b4d622060848e75414f8800a4aa3 SHA-256: af0931ecfcdeefd95d8ba50ae4d6cfa75f5d7ce047f7fdefdca36bd37005a1d6
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, which is a known technique for executing malicious code upon opening the document. The `RUN=0` formula API suggests the macro is designed to execute external commands, likely for downloading and executing a second-stage payload. No specific family could be identified.

Heuristics 3

  • 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.
  • 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) 6593 bytes
SHA-256: f8bd43d9ff9d895af7a87db6aaf20d6e7a2b4f9435ccbbc34ede56534f6b171c
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  KwAXAyX
' 0018     24 LABEL : Cell Value, String Constant - aeAdZvecu len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E143 
' 0018     27 LABEL : Cell Value, String Constant - bGUWZcUJHHjj len=0 
' 0018     26 LABEL : Cell Value, String Constant - EQLJwKPORhZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - gKPgimVT len=0 
' 0018     22 LABEL : Cell Value, String Constant - hLNaIVO len=0 
' 0018     27 LABEL : Cell Value, String Constant - IRVxyYAKAWIK len=0 
' 0018     27 LABEL : Cell Value, String Constant - jariGdxcwhuO len=0 
' 0018     21 LABEL : Cell Value, String Constant - kNedFL len=0 
' 0018     23 LABEL : Cell Value, String Constant - KOXiiOkJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - KVvtgsskWK len=0 
' 0018     26 LABEL : Cell Value, String Constant - lfgwLdgeXsl len=0 
' 0018     23 LABEL : Cell Value, String Constant - LijHTlva len=0 
' 0018     24 LABEL : Cell Value, String Constant - mffqTBdjz len=0 
' 0018     24 LABEL : Cell Value, String Constant - mpjCjWvxN len=0 
' 0018     23 LABEL : Cell Value, String Constant - NfDgikSy len=0 
' 0018     23 LABEL : Cell Value, String Constant - PmNVZBBF len=0 
' 0018     21 LABEL : Cell Value, String Constant - RHiYlw len=0 
' 0018     25 LABEL : Cell Value, String Constant - TMnXFqODdX len=0 
' 0018     20 LABEL : Cell Value, String Constant - vSYAF len=0 
' 0018     23 LABEL : Cell Value, String Constant - zBORMqTf len=0 
' 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
' 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
' 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
' 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
' 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
' 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
' 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
' 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
' 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
' 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
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 
... (truncated)

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