Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a95666e4d5685d4e…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:43:16 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 6e440ec4026a2801b084dac07e72b95a SHA-1: e2844bf637f4fdf1d81fd8ea49e469e194d90220 SHA-256: a95666e4d5685d4e2c067f3500c8a8e04539d8eda0d1279beae818de9c4cef0f
140 Risk Score

Malware Insights

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

The file is identified as a malicious Excel 4.0 macro-enabled workbook. Critical heuristics indicate the presence of an Auto_Open defined name and the use of dangerous formula APIs, specifically 'RUN'. This suggests the macro is designed to execute arbitrary commands upon opening the workbook, likely to download and run a secondary payload.

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) 6696 bytes
SHA-256: 436f198d1bf8eca2fb01a832bacde8f2483c60c19393d39477c9ef69d313a09c
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  GhaQNI
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A140 
' 0018     21 LABEL : Cell Value, String Constant - BouRjX len=0 
' 0018     22 LABEL : Cell Value, String Constant - CNgwTks len=0 
' 0018     22 LABEL : Cell Value, String Constant - dxJMrPX len=0 
' 0018     26 LABEL : Cell Value, String Constant - gDkvcuYQqPw len=0 
' 0018     25 LABEL : Cell Value, String Constant - gHZlDxRZut len=0 
' 0018     25 LABEL : Cell Value, String Constant - HRUWFVLJFe len=0 
' 0018     22 LABEL : Cell Value, String Constant - hSyoDFv len=0 
' 0018     25 LABEL : Cell Value, String Constant - JPyIryKOax len=0 
' 0018     20 LABEL : Cell Value, String Constant - LNCOK len=0 
' 0018     25 LABEL : Cell Value, String Constant - LPkfgQRkQH len=0 
' 0018     20 LABEL : Cell Value, String Constant - lplZk len=0 
' 0018     23 LABEL : Cell Value, String Constant - OfBRcmtH len=0 
' 0018     20 LABEL : Cell Value, String Constant - PtIOZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - QdKCwdSUyexp len=0 
' 0018     27 LABEL : Cell Value, String Constant - tvxabOcDCBKz len=0 
' 0018     23 LABEL : Cell Value, String Constant - vIejrLkS len=0 
' 0018     27 LABEL : Cell Value, String Constant - vnKyeWoEgRBN len=0 
' 0018     21 LABEL : Cell Value, String Constant - WVTPAo len=0 
' 0018     20 LABEL : Cell Value, String Constant - XPvvf len=0 
' 0018     21 LABEL : Cell Value, String Constant - YkTihF 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 LABE
... (truncated)

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