Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b93e2ef4b82315e5…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:56 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 7eb09dd4a146411ba65f8a6761a594bb SHA-1: d08ccd8ccc2d324116a4ebe6b1b616e5d21cd472 SHA-256: b93e2ef4b82315e5dfaa093f577b0ea175a31fc240b0f80f8aed24f9953df844
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, which is a common method for executing malicious code when an Excel file is opened. The `RUN` formula API suggests the macro is designed to execute an external command or download a payload. While no specific URLs or hashes were extracted, the technique strongly implies a downloader or initial execution stage.

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) 6681 bytes
SHA-256: cd8f3578f1e5f4a459948b9ac80ec0554365d67e8c6dc96f16daa059a4086f9f
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 -  dBQFYC
' 0018     20 LABEL : Cell Value, String Constant - AgZXo len=0 
' 0018     25 LABEL : Cell Value, String Constant - aomvudtkzQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I166 
' 0018     23 LABEL : Cell Value, String Constant - bFdPLaat len=0 
' 0018     25 LABEL : Cell Value, String Constant - bGoTSbmwll len=0 
' 0018     22 LABEL : Cell Value, String Constant - DQNqCUq len=0 
' 0018     23 LABEL : Cell Value, String Constant - Feftbzpw len=0 
' 0018     26 LABEL : Cell Value, String Constant - GSrPfcXfyfH len=0 
' 0018     26 LABEL : Cell Value, String Constant - jZeshmlGMzE len=0 
' 0018     20 LABEL : Cell Value, String Constant - KFVXG len=0 
' 0018     24 LABEL : Cell Value, String Constant - NNTfXfghQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - ozQITVvsOzJS len=0 
' 0018     21 LABEL : Cell Value, String Constant - scqgAx len=0 
' 0018     20 LABEL : Cell Value, String Constant - TVdNs len=0 
' 0018     24 LABEL : Cell Value, String Constant - twtuoyFsI len=0 
' 0018     24 LABEL : Cell Value, String Constant - uimbGFeyT len=0 
' 0018     23 LABEL : Cell Value, String Constant - vvYJLoqR len=0 
' 0018     25 LABEL : Cell Value, String Constant - wDGMfeJpoa len=0 
' 0018     23 LABEL : Cell Value, String Constant - wngGqzDw len=0 
' 0018     21 LABEL : Cell Value, String Constant - XlodWK len=0 
' 0018     24 LABEL : Cell Value, String Constant - YwJCShcLr 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 
... (truncated)

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