Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2fdfb3406eef9b34…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:25:44 Authoring application: Microsoft Excel First seen: 2021-07-07
MD5: b0aa2f8b497a0215bad1dd937b952433 SHA-1: 82843a8d1a4fb2c9e094f186d3a4d811ce6fd5c0 SHA-256: 2fdfb3406eef9b348f8380eaf1c4a6ec3848de639e4ce800a3d8a9b04e7c5202
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. This suggests the macro is designed to execute arbitrary code upon opening the workbook.

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) 6383 bytes
SHA-256: 936f7e34fb509c503da917116def8757048f83a13a737190d950a4df2c442f57
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  RECgE
' 0018     20 LABEL : Cell Value, String Constant - ACYum len=0 
' 0018     20 LABEL : Cell Value, String Constant - aUjqy len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D178 
' 0018     20 LABEL : Cell Value, String Constant - FJUcA len=0 
' 0018     24 LABEL : Cell Value, String Constant - gftglQyjD len=0 
' 0018     26 LABEL : Cell Value, String Constant - GjRxFXVgpYJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - HjsOUAPH len=0 
' 0018     23 LABEL : Cell Value, String Constant - iHxpuIzh len=0 
' 0018     26 LABEL : Cell Value, String Constant - joCSVZSlUxc len=0 
' 0018     21 LABEL : Cell Value, String Constant - KIbZQB len=0 
' 0018     23 LABEL : Cell Value, String Constant - mjfwoktc len=0 
' 0018     22 LABEL : Cell Value, String Constant - mOkahMA len=0 
' 0018     23 LABEL : Cell Value, String Constant - MWUSJfme len=0 
' 0018     21 LABEL : Cell Value, String Constant - NdRryE len=0 
' 0018     20 LABEL : Cell Value, String Constant - oqCaW len=0 
' 0018     26 LABEL : Cell Value, String Constant - QwHIFlcnolP len=0 
' 0018     21 LABEL : Cell Value, String Constant - soFiWj len=0 
' 0018     23 LABEL : Cell Value, String Constant - TJERSnKG len=0 
' 0018     21 LABEL : Cell Value, String Constant - UIdbUU len=0 
' 0018     21 LABEL : Cell Value, String Constant - wxpFFb len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZOuoywFBrbxi 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 LABELSST : Cell 
... (truncated)

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