Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 acfde7b7e4311fdd…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:47:18 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 93ecc53ea852705ddec8d88a12021589 SHA-1: 5182203f767ddd7338f308e576c5780a4d46b035 SHA-256: acfde7b7e4311fdd96cb13b08b75f6e84cbb062dc6d45c9e51a2da70d3487025
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro sheet that contains an Auto_Open defined name, indicating that it will execute macros automatically when the workbook is opened. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. While no specific URLs or hashes were extracted, the Auto_Open functionality is a strong indicator of malicious intent, likely to download and execute 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) 6510 bytes
SHA-256: 09d19108607e05e319c3ff6e19b215cf72980ac6c13d53d6c8d4f36c1b887ee2
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 -  pDgBpn
' 0018     23 LABEL : Cell Value, String Constant - alTsXLkY len=0 
' 0018     24 LABEL : Cell Value, String Constant - aMPCxjJnu len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C190 
' 0018     23 LABEL : Cell Value, String Constant - BQJNoaFd len=0 
' 0018     22 LABEL : Cell Value, String Constant - DFlYXpG len=0 
' 0018     25 LABEL : Cell Value, String Constant - DodijBCzwv len=0 
' 0018     26 LABEL : Cell Value, String Constant - EkWUEWNXNYz len=0 
' 0018     26 LABEL : Cell Value, String Constant - HdsDlgupqDk len=0 
' 0018     25 LABEL : Cell Value, String Constant - IbjGrKkdyb len=0 
' 0018     26 LABEL : Cell Value, String Constant - jRhlvHJXHri len=0 
' 0018     25 LABEL : Cell Value, String Constant - NGdLPxxaZS len=0 
' 0018     26 LABEL : Cell Value, String Constant - OagMvdTSden len=0 
' 0018     22 LABEL : Cell Value, String Constant - oeuXoaZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - oxNsskTrQqOh len=0 
' 0018     23 LABEL : Cell Value, String Constant - sEMuWiLM len=0 
' 0018     24 LABEL : Cell Value, String Constant - ShgrZCBvH len=0 
' 0018     20 LABEL : Cell Value, String Constant - UCBgf len=0 
' 0018     22 LABEL : Cell Value, String Constant - veordPY len=0 
' 0018     24 LABEL : Cell Value, String Constant - VszxGIrZg len=0 
' 0018     25 LABEL : Cell Value, String Constant - wNantqeCUb len=0 
' 0018     21 LABEL : Cell Value, String Constant - yDxlYe 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
'
... (truncated)

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