Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9299a06a95dad013…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:34 Authoring application: Microsoft Excel First seen: 2021-05-23
MD5: 4db56e8f0c0c326d23e2def587dbd1be SHA-1: 75b7e2a21dd9948b356ac1de9b8722ba74c33af6 SHA-256: 9299a06a95dad0134efe5e9aef94e179d45644b317606ec827348444a03c167c
140 Risk Score

Malware Insights

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

The file is an Excel document containing Excel 4.0 macros, specifically an Auto_Open function. This function is designed to execute automatically when the workbook is opened, indicating an attempt to run arbitrary code. 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) 6539 bytes
SHA-256: 335f921b85befc3985d098512b32f95c54bffd5f844790b49cf52ad4b74a4f00
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 -  AwdaZuLyW
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B140 
' 0018     21 LABEL : Cell Value, String Constant - AyRNrj len=0 
' 0018     20 LABEL : Cell Value, String Constant - BIDeO len=0 
' 0018     21 LABEL : Cell Value, String Constant - cwWlIZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - dFseyzpBeVUM len=0 
' 0018     23 LABEL : Cell Value, String Constant - EMguKwSz len=0 
' 0018     20 LABEL : Cell Value, String Constant - fKnfF len=0 
' 0018     22 LABEL : Cell Value, String Constant - fOGlGpk len=0 
' 0018     21 LABEL : Cell Value, String Constant - gFMaaW len=0 
' 0018     21 LABEL : Cell Value, String Constant - iKWoAE len=0 
' 0018     20 LABEL : Cell Value, String Constant - lxZTR len=0 
' 0018     25 LABEL : Cell Value, String Constant - movRoSrAkD len=0 
' 0018     22 LABEL : Cell Value, String Constant - NeQqDmr len=0 
' 0018     23 LABEL : Cell Value, String Constant - NONxGvIM len=0 
' 0018     21 LABEL : Cell Value, String Constant - qFVdce len=0 
' 0018     27 LABEL : Cell Value, String Constant - qhwfWStdaDyM len=0 
' 0018     27 LABEL : Cell Value, String Constant - QZfPfRGNePBq len=0 
' 0018     27 LABEL : Cell Value, String Constant - ragKlcjjfYuy len=0 
' 0018     23 LABEL : Cell Value, String Constant - TkjycLYv len=0 
' 0018     22 LABEL : Cell Value, String Constant - VCqCORt len=0 
' 0018     27 LABEL : Cell Value, String Constant - YyRXhCQMmpnH 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 LAB
... (truncated)

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