Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 64ea6ba74af9e848…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:47 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 7e7c50f01baa8feab4086c008b35d5e8 SHA-1: 47e3e7a67b3b0a3c375a9e1adc17589fc9a340e5 SHA-256: 64ea6ba74af9e8486e69165c78ba341d3504c6d8f520fb6a595e294c9c50c4c2
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 defined name, which is a common technique for executing malicious code. The `RUN` function API is also present, suggesting the macro attempts to execute a command or payload. While no specific URLs or hashes were extracted, the Auto_Open macro itself is the primary indicator of malicious intent.

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) 6489 bytes
SHA-256: 9b26bc57e846db1e1cae38ebea2866e1f29f49b3bedb96e5ab328fda9ddf6bde
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  xtHsKOPc
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E200 
' 0018     25 LABEL : Cell Value, String Constant - CMuRbBVJIm len=0 
' 0018     22 LABEL : Cell Value, String Constant - DDygkXF len=0 
' 0018     23 LABEL : Cell Value, String Constant - ewaJBaml len=0 
' 0018     27 LABEL : Cell Value, String Constant - FbiLBZYkQfAo len=0 
' 0018     21 LABEL : Cell Value, String Constant - hndCdp len=0 
' 0018     20 LABEL : Cell Value, String Constant - JtGUK len=0 
' 0018     22 LABEL : Cell Value, String Constant - LfxFHBm len=0 
' 0018     22 LABEL : Cell Value, String Constant - mgEgJtW len=0 
' 0018     22 LABEL : Cell Value, String Constant - mrZxCck len=0 
' 0018     20 LABEL : Cell Value, String Constant - NiZDm len=0 
' 0018     24 LABEL : Cell Value, String Constant - NPJpsRqTX len=0 
' 0018     24 LABEL : Cell Value, String Constant - NWcDzCYYH len=0 
' 0018     25 LABEL : Cell Value, String Constant - OMxVEcsCBr len=0 
' 0018     20 LABEL : Cell Value, String Constant - PhaaP len=0 
' 0018     21 LABEL : Cell Value, String Constant - QQkHte len=0 
' 0018     26 LABEL : Cell Value, String Constant - RuWANhJNtJJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - SpgXcvy len=0 
' 0018     26 LABEL : Cell Value, String Constant - XAacWShklAR len=0 
' 0018     20 LABEL : Cell Value, String Constant - YypOS len=0 
' 0018     20 LABEL : Cell Value, String Constant - zpsMO 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 : C
... (truncated)

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