Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4f5800f3f115521a…

MALICIOUS

Office (OLE)

256.5 KB Created: 2020-07-20 13:33:58 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: 46ad2ec787a0a328a0529afdc64794c0 SHA-1: 2b900a15b373084bde96369441e7b6759adfc758 SHA-256: 4f5800f3f115521ab5755c9bcf3cfc57914988f5c90c54cd9438060658570692
140 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro-enabled workbook containing an Auto_Open macro, which is a critical finding indicating automatic execution upon opening. The document body displays a deceptive message prompting the user to enable content, a common social engineering tactic. The presence of dangerous formula APIs within the XLM macro further supports its 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) 271285 bytes
SHA-256: ee23ee29178c3577540d28e565ba208f2e0ef8f71e10802d0d5353234eb2f666
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  prR9khcg0
' 0018     24 LABEL : Cell Value, String Constant - agRqmfVXe len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open hidden len=7 ptgNameX  NAMEIDX 9 
' 0018     25 LABEL : Cell Value, String Constant - BIuXWsMzWK len=0 
' 0018     22 LABEL : Cell Value, String Constant - bRLNSAy len=0 
' 0018     21 LABEL : Cell Value, String Constant - bsmDWS len=0 
' 0018     26 LABEL : Cell Value, String Constant - cvaugMDXPqd len=0 
' 0018     25 LABEL : Cell Value, String Constant - ltTNTXorZn len=0 
' 0018     21 LABEL : Cell Value, String Constant - ORiPLM len=0 
' 0018     29 LABEL : Cell Value, String Constant -         hidden len=7 ptgRef3d  Sheet!EX3669 
' 0018     27 LABEL : Cell Value, String Constant - qcFdOJkhEkxI len=0 
' 0018     26 LABEL : Cell Value, String Constant - ryRTWARweFI len=0 
' 0018     27 LABEL : Cell Value, String Constant - TmsKQsPmdcLj len=0 
' 0018     26 LABEL : Cell Value, String Constant - vGiQQfgsMNL len=0 
' 0018     23 LABEL : Cell Value, String Constant - XMyeDprX len=0 
' 0018     26 LABEL : Cell Value, String Constant - xZlwKFZIxiO len=0 
' 0018     25 LABEL : Cell Value, String Constant - yMseWPYtmk len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZQHUAaTXa 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 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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