Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6844e46d3a120896…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:41:00 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: ee30a62924020ccf8deb08174f4d66bf SHA-1: 66d82fa21df481ff54e64c1d0b5eed02dfea6ef8 SHA-256: 6844e46d3a12089656188e12d0c0ad4b79949cb7849637dfabb282e5347a73a0
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 upon opening the document. The `RUN` function API was identified, suggesting the macro attempts to execute a command or payload. The document body contains obfuscated text, likely part of the macro's execution flow.

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) 6537 bytes
SHA-256: fafc4f19b300fbfaeacf960fbd15e5c7f3f64a621b0928f3e79f69ec8b65f711
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 -  UUjHxUeYE
' 0018     25 LABEL : Cell Value, String Constant - AmehZerIUg len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D144 
' 0018     25 LABEL : Cell Value, String Constant - bReDmJjkwV len=0 
' 0018     24 LABEL : Cell Value, String Constant - cBUNyvpNg len=0 
' 0018     24 LABEL : Cell Value, String Constant - eHOQqCHhI len=0 
' 0018     22 LABEL : Cell Value, String Constant - erxFsYz len=0 
' 0018     24 LABEL : Cell Value, String Constant - gtENKeyJD len=0 
' 0018     21 LABEL : Cell Value, String Constant - ikCFFL len=0 
' 0018     26 LABEL : Cell Value, String Constant - lrtuUlVaGFa len=0 
' 0018     21 LABEL : Cell Value, String Constant - lugLQE len=0 
' 0018     20 LABEL : Cell Value, String Constant - MwlPO len=0 
' 0018     25 LABEL : Cell Value, String Constant - pVwuHyzJMb len=0 
' 0018     23 LABEL : Cell Value, String Constant - rdeTcczo len=0 
' 0018     20 LABEL : Cell Value, String Constant - sWiaU len=0 
' 0018     21 LABEL : Cell Value, String Constant - TLyrRa len=0 
' 0018     20 LABEL : Cell Value, String Constant - uDSeF len=0 
' 0018     21 LABEL : Cell Value, String Constant - UmRrMb len=0 
' 0018     22 LABEL : Cell Value, String Constant - Vqxeait len=0 
' 0018     24 LABEL : Cell Value, String Constant - VzUFtqZwO len=0 
' 0018     21 LABEL : Cell Value, String Constant - xVSZlo len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZnCeRvcEFlfO 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 LABELSS
... (truncated)

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