Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d3bd5c54323df79e…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:38 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 3f8593f8e3e2415a782b56dbb5098feb SHA-1: 32d182eccaf6e1b4daf0a34578e4f426cdbc9994 SHA-256: d3bd5c54323df79e4ff56b49bce88b1f48286d7aabf0380b058f8a95d8ec0b19
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating potential for arbitrary code execution. The presence of dangerous formula APIs like RUN further supports this. This suggests the file is designed to be delivered as an attachment and execute malicious code upon opening.

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) 6437 bytes
SHA-256: e830136a0914153239283bf103dbd6008a4f1caf9d8217dcf9f970e3f4127227
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 -  QarpE
' 0018     20 LABEL : Cell Value, String Constant - aNiMm len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A185 
' 0018     20 LABEL : Cell Value, String Constant - dZIhl len=0 
' 0018     27 LABEL : Cell Value, String Constant - eCiEQdZwKurG len=0 
' 0018     27 LABEL : Cell Value, String Constant - gmnDgUcgzWXY len=0 
' 0018     22 LABEL : Cell Value, String Constant - iAkiwFu len=0 
' 0018     22 LABEL : Cell Value, String Constant - IPCheOp len=0 
' 0018     21 LABEL : Cell Value, String Constant - JAuytu len=0 
' 0018     26 LABEL : Cell Value, String Constant - kUzrdWjfyBZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - mLguAp len=0 
' 0018     21 LABEL : Cell Value, String Constant - njKdwT len=0 
' 0018     20 LABEL : Cell Value, String Constant - ODnTx len=0 
' 0018     21 LABEL : Cell Value, String Constant - pIvMtC len=0 
' 0018     25 LABEL : Cell Value, String Constant - TDnmNmVVlE len=0 
' 0018     23 LABEL : Cell Value, String Constant - tJYSiSGb len=0 
' 0018     21 LABEL : Cell Value, String Constant - TwYvxw len=0 
' 0018     22 LABEL : Cell Value, String Constant - UsQNoNt len=0 
' 0018     24 LABEL : Cell Value, String Constant - vzusBCoRx len=0 
' 0018     27 LABEL : Cell Value, String Constant - WLeALHjghRGO len=0 
' 0018     23 LABEL : Cell Value, String Constant - WlQRzUlA len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZLTII 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 : Cel
... (truncated)

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