Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9098d687c94f7427…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:42:17 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 19d8b763e00bb47b92a0de2036b8e4b3 SHA-1: 68e6b02512e127223fa3a82610302f28b80a1bed SHA-256: 9098d687c94f7427b2017fc2afcb98fca94cbe829e0fd4fb0fe8f4db2c19b201
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open defined name, which is a critical indicator of malicious intent. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. This functionality is commonly used to download and execute further malicious payloads.

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) 6794 bytes
SHA-256: cfaa78e2ad826e91f8f88a4537643b11dab689ddf79ec5386db502dfbdeea765
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  rSXhUdjbt
' 0018     20 LABEL : Cell Value, String Constant - AIUpG len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F135 
' 0018     20 LABEL : Cell Value, String Constant - DOxET len=0 
' 0018     22 LABEL : Cell Value, String Constant - FTmiqly len=0 
' 0018     27 LABEL : Cell Value, String Constant - GNAdpCmfKYkO len=0 
' 0018     26 LABEL : Cell Value, String Constant - hFPlFfTgaDW len=0 
' 0018     20 LABEL : Cell Value, String Constant - jJnSJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - kbauWHauRK len=0 
' 0018     24 LABEL : Cell Value, String Constant - LUZHgzIpu len=0 
' 0018     22 LABEL : Cell Value, String Constant - Nbkuvxq len=0 
' 0018     24 LABEL : Cell Value, String Constant - NRzYvfREJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - OivkHGkIXWa len=0 
' 0018     27 LABEL : Cell Value, String Constant - pDmnkgHrADET len=0 
' 0018     27 LABEL : Cell Value, String Constant - qgcEZBNtnVcY len=0 
' 0018     27 LABEL : Cell Value, String Constant - qplYuXmnpaql len=0 
' 0018     20 LABEL : Cell Value, String Constant - RgYnh len=0 
' 0018     25 LABEL : Cell Value, String Constant - UrimfYcekW len=0 
' 0018     25 LABEL : Cell Value, String Constant - VzDTQeRwcm len=0 
' 0018     25 LABEL : Cell Value, String Constant - yuJAXIuhYQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - zKWfeOLC len=0 
' 0018     22 LABEL : Cell Value, String Constant - zOWukbL 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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