Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3bf923033597e849…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:41:41 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 68065e4e01cd75209f6db052166f1811 SHA-1: a15e6b0def13237b1793cd0974366bb164c4d50f SHA-256: 3bf923033597e849981f5e0d6be4c71dd49abe563e76d6d3fbe47b9a04e1d5a8
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. This indicates an attempt to automatically execute code upon opening the document. The presence of dangerous formula APIs like RUN further suggests malicious intent, likely to download and execute a second-stage 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) 6540 bytes
SHA-256: 6dc7f2dd0bd24cab663b04b2a27c8d8092c1b659e757d8ef783a3dc62075e079
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  iYSp
' 0018     21 LABEL : Cell Value, String Constant - aNOPaS len=0 
' 0018     22 LABEL : Cell Value, String Constant - AtlWxIc len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G134 
' 0018     23 LABEL : Cell Value, String Constant - axmBQkuV len=0 
' 0018     20 LABEL : Cell Value, String Constant - bffGr len=0 
' 0018     26 LABEL : Cell Value, String Constant - CPyuAcjCnXM len=0 
' 0018     21 LABEL : Cell Value, String Constant - ErWGNn len=0 
' 0018     25 LABEL : Cell Value, String Constant - FpvJAudxVL len=0 
' 0018     21 LABEL : Cell Value, String Constant - hOJNiW len=0 
' 0018     25 LABEL : Cell Value, String Constant - HxuxablqiN len=0 
' 0018     23 LABEL : Cell Value, String Constant - LQzUxkMb len=0 
' 0018     23 LABEL : Cell Value, String Constant - mHqpOYBg len=0 
' 0018     20 LABEL : Cell Value, String Constant - ndKdj len=0 
' 0018     20 LABEL : Cell Value, String Constant - OgpDR len=0 
' 0018     24 LABEL : Cell Value, String Constant - QuUewsMpk len=0 
' 0018     20 LABEL : Cell Value, String Constant - QvVXF len=0 
' 0018     21 LABEL : Cell Value, String Constant - wfPZBs len=0 
' 0018     23 LABEL : Cell Value, String Constant - WqicBkfa len=0 
' 0018     25 LABEL : Cell Value, String Constant - XzgSLxyFkS len=0 
' 0018     25 LABEL : Cell Value, String Constant - YROIHbClZh len=0 
' 0018     25 LABEL : Cell Value, String Constant - YWrnMZrdsj 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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