Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3d0d9da9d8218feb…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:29:19 Authoring application: Microsoft Excel First seen: 2021-07-02
MD5: 75a17ed89057893d583448c96243807f SHA-1: f8282cfe7835542e1d55761c516e87acf342d137 SHA-256: 3d0d9da9d8218febe5a9532e4d5ea0cfab7252f234b1d72968755a20eb46aa0c
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a known technique for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN indicates an intent to execute arbitrary commands or download payloads. No specific URLs or hashes were extracted, but the macro execution itself is the primary indicator of compromise.

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) 6666 bytes
SHA-256: 00151aeb19b15fe1a3344799ceac5b92c47d7b94636d20eb474571a0e7190d4a
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 -  dbneHDnm
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E143 
' 0018     24 LABEL : Cell Value, String Constant - BVMjApQSi len=0 
' 0018     25 LABEL : Cell Value, String Constant - cYjVBuYVnM len=0 
' 0018     21 LABEL : Cell Value, String Constant - dnURpa len=0 
' 0018     23 LABEL : Cell Value, String Constant - DRvvdayc len=0 
' 0018     25 LABEL : Cell Value, String Constant - eYNpisFyej len=0 
' 0018     25 LABEL : Cell Value, String Constant - eyyKRfBzhK len=0 
' 0018     24 LABEL : Cell Value, String Constant - HibOPRJPZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - hyYqBB len=0 
' 0018     20 LABEL : Cell Value, String Constant - IVgNb len=0 
' 0018     25 LABEL : Cell Value, String Constant - JrGJEZNEcR len=0 
' 0018     27 LABEL : Cell Value, String Constant - JZkgNJgGWysH len=0 
' 0018     24 LABEL : Cell Value, String Constant - KzfohrTkE len=0 
' 0018     27 LABEL : Cell Value, String Constant - luRoNiScQBqY len=0 
' 0018     20 LABEL : Cell Value, String Constant - mmRkM len=0 
' 0018     24 LABEL : Cell Value, String Constant - mwERhcLOc len=0 
' 0018     21 LABEL : Cell Value, String Constant - pcKOZg len=0 
' 0018     20 LABEL : Cell Value, String Constant - RoREv len=0 
' 0018     27 LABEL : Cell Value, String Constant - RoZuceCLlees len=0 
' 0018     25 LABEL : Cell Value, String Constant - ujaPVvSWRW len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZhLiGYSQtG 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
' 00f
... (truncated)

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