Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1b26a0926b3bdc33…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:38:20 Authoring application: Microsoft Excel First seen: 2021-09-25
MD5: e5dc72b1fc203c7c64342b12c700a067 SHA-1: 42aaf0b9ec09e79cdabf0d6d8de37b23aea752a2 SHA-256: 1b26a0926b3bdc3367cc939dc89933e533620cac45b8c31f42eeecaa2193a8db
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 a macro will execute automatically upon opening the workbook. The presence of dangerous formula APIs within the XLM macro suggests an intent 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) 6827 bytes
SHA-256: 2fcde70b009be6eadfaf977b5d1fa4db2a7df46e1d2dea2b995d8e9210673383
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 -  bKENfjodV
' 0018     22 LABEL : Cell Value, String Constant - AHLveAQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - aMDZpCVhBj len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H134 
' 0018     23 LABEL : Cell Value, String Constant - aVdHiYdn len=0 
' 0018     20 LABEL : Cell Value, String Constant - dPqvB len=0 
' 0018     24 LABEL : Cell Value, String Constant - flkTqCECe len=0 
' 0018     27 LABEL : Cell Value, String Constant - FRgeGkJkwKPl len=0 
' 0018     20 LABEL : Cell Value, String Constant - gtQpn len=0 
' 0018     20 LABEL : Cell Value, String Constant - HKjjm len=0 
' 0018     24 LABEL : Cell Value, String Constant - HvIPNPeqq len=0 
' 0018     26 LABEL : Cell Value, String Constant - iCskBWfduio len=0 
' 0018     22 LABEL : Cell Value, String Constant - jNRZSPF len=0 
' 0018     25 LABEL : Cell Value, String Constant - lBqKFUwcVq len=0 
' 0018     27 LABEL : Cell Value, String Constant - MzvzVsczyTEa len=0 
' 0018     25 LABEL : Cell Value, String Constant - PtDvlCblNQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - qBtgODixs len=0 
' 0018     23 LABEL : Cell Value, String Constant - QRWOQHQL len=0 
' 0018     24 LABEL : Cell Value, String Constant - TiUdIWIli len=0 
' 0018     25 LABEL : Cell Value, String Constant - udWmsonaIS len=0 
' 0018     20 LABEL : Cell Value, String Constant - uzecO len=0 
' 0018     23 LABEL : Cell Value, String Constant - XmciyBVB 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  
... (truncated)

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