Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2b0e270f2e90d842…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:42:33 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: ef52c84225f3bfb2cfa9cbcef99a5306 SHA-1: 6a8df4ad1a6af31d99c707fa3001dd86c4637dd0 SHA-256: 2b0e270f2e90d84227ffb72d312aa4ad8c8a013075d4f23832294261d671d817
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating potential malicious execution. The presence of dangerous formula APIs like RUN further supports this. The macro sheet itself contains obfuscated data, suggesting an attempt to hide malicious functionality.

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) 6803 bytes
SHA-256: 35a5047ab92cce0f39f6d6d971b9eb8098468efd8b2d90df2a970daae357be5a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  CNgaNfZsnh
' 0018     20 LABEL : Cell Value, String Constant - AeeHJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - AMtdaOSk len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F140 
' 0018     24 LABEL : Cell Value, String Constant - fqlJcPrmT len=0 
' 0018     23 LABEL : Cell Value, String Constant - GCRdbeQT len=0 
' 0018     20 LABEL : Cell Value, String Constant - GRNik len=0 
' 0018     21 LABEL : Cell Value, String Constant - InleCG len=0 
' 0018     26 LABEL : Cell Value, String Constant - IZBjKqBibNE len=0 
' 0018     25 LABEL : Cell Value, String Constant - jrHljzZbsr len=0 
' 0018     23 LABEL : Cell Value, String Constant - lHENYYuu len=0 
' 0018     25 LABEL : Cell Value, String Constant - lJLXUiRRYf len=0 
' 0018     20 LABEL : Cell Value, String Constant - lSiJE len=0 
' 0018     20 LABEL : Cell Value, String Constant - Rkbbk len=0 
' 0018     23 LABEL : Cell Value, String Constant - rVIqOpRn len=0 
' 0018     26 LABEL : Cell Value, String Constant - SIZlqGcsbFz len=0 
' 0018     24 LABEL : Cell Value, String Constant - tQyYuOCWu len=0 
' 0018     22 LABEL : Cell Value, String Constant - UUnBjAC len=0 
' 0018     25 LABEL : Cell Value, String Constant - XPQXtkkWle len=0 
' 0018     20 LABEL : Cell Value, String Constant - xvecN len=0 
' 0018     27 LABEL : Cell Value, String Constant - XyfYClTnwRyE len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZmmxahByU 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
' 00fd     10 L
... (truncated)

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