Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a460684af907c2d2…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:26:46 Authoring application: Microsoft Excel First seen: 2021-06-17
MD5: 890f28955315281d8d63ef7394583e67 SHA-1: 3274b49d10f1a2fe2fb94acdeedf166bde3e0184 SHA-256: a460684af907c2d2e1025a3a8ffc75d0da23208c54093acc83dddb27eb4cd60c
140 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 (XLM) macros, specifically triggering an Auto_Open macro. This indicates the file is designed to execute code upon opening. The presence of dangerous formula APIs like 'RUN' suggests the macro is intended to download and execute a secondary payload, a common technique for malware delivery.

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) 6554 bytes
SHA-256: 778858b1db30a2ea8bed8d2aec46992279bd6fd20993b748c045822914cc254f
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 -  IqxUxnxzV
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H180 
' 0018     20 LABEL : Cell Value, String Constant - AveUm len=0 
' 0018     23 LABEL : Cell Value, String Constant - BKQUMkel len=0 
' 0018     24 LABEL : Cell Value, String Constant - bVGozmqoW len=0 
' 0018     20 LABEL : Cell Value, String Constant - cHZLO len=0 
' 0018     26 LABEL : Cell Value, String Constant - cpTcAwBTDoL len=0 
' 0018     21 LABEL : Cell Value, String Constant - dhxXQv len=0 
' 0018     23 LABEL : Cell Value, String Constant - EzkfSeqi len=0 
' 0018     22 LABEL : Cell Value, String Constant - GjDdHPw len=0 
' 0018     23 LABEL : Cell Value, String Constant - hIwLYWrY len=0 
' 0018     25 LABEL : Cell Value, String Constant - kEipBmKjUm len=0 
' 0018     23 LABEL : Cell Value, String Constant - MjOgxtLW len=0 
' 0018     27 LABEL : Cell Value, String Constant - naofNoBnoeLM len=0 
' 0018     21 LABEL : Cell Value, String Constant - OJWjpZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - siiXWuSH len=0 
' 0018     23 LABEL : Cell Value, String Constant - snlMMwly len=0 
' 0018     26 LABEL : Cell Value, String Constant - SxmOLxlxakY len=0 
' 0018     27 LABEL : Cell Value, String Constant - TayYsmDDjrqA len=0 
' 0018     21 LABEL : Cell Value, String Constant - YmyyLl len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZFJwQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZIEBbbab 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 LA
... (truncated)

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