Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f2f7a032d1c6eb2b…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:41:11 Authoring application: Microsoft Excel First seen: 2021-06-04
MD5: e2d48994046e7c60494dc7051ddf651a SHA-1: d6da0b720ca7d1ea3cfd320ba6652e45f175a89e SHA-256: f2f7a032d1c6eb2b7b2ded1f0957292956b9bd0c0be5fdd7957f3b749a17ec54
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-enabled workbook. Static analysis detected an Auto_Open defined name, indicating that macros will execute automatically upon opening the document. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely to download and run 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: d230140561979e6e3b5ce89db9f493ef9f15a9c70c55686d1dbcbb5cefed5ae7
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 -  eEZwSg
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F150 
' 0018     20 LABEL : Cell Value, String Constant - BIcSB len=0 
' 0018     27 LABEL : Cell Value, String Constant - bqGdvKSVesfX len=0 
' 0018     23 LABEL : Cell Value, String Constant - BurtGiLR len=0 
' 0018     26 LABEL : Cell Value, String Constant - BwSJPwxwTZo len=0 
' 0018     24 LABEL : Cell Value, String Constant - ciBnGyQvI len=0 
' 0018     24 LABEL : Cell Value, String Constant - CTIfRKvBk len=0 
' 0018     25 LABEL : Cell Value, String Constant - enJGhnRbre len=0 
' 0018     20 LABEL : Cell Value, String Constant - eXgqD len=0 
' 0018     24 LABEL : Cell Value, String Constant - fpCMcNEwy len=0 
' 0018     22 LABEL : Cell Value, String Constant - fYVqFLf len=0 
' 0018     22 LABEL : Cell Value, String Constant - HGmyVtB len=0 
' 0018     23 LABEL : Cell Value, String Constant - MiMCqjdX len=0 
' 0018     20 LABEL : Cell Value, String Constant - oklYZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - oNvfaGiudce len=0 
' 0018     27 LABEL : Cell Value, String Constant - pMUypQJFROzu len=0 
' 0018     25 LABEL : Cell Value, String Constant - PUHYgUFdpG len=0 
' 0018     27 LABEL : Cell Value, String Constant - pUWKNthAZeyy len=0 
' 0018     21 LABEL : Cell Value, String Constant - wOOvWA len=0 
' 0018     26 LABEL : Cell Value, String Constant - wXhkGujqLjz len=0 
' 0018     26 LABEL : Cell Value, String Constant - xpZUaEulOXD 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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