Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0e15efeaade46f26…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:43:28 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 6ba13122d278617182a944a0d2b3f5ca SHA-1: 8ee56493f3204f9a8bc9ba81b1af70bf7342df9f SHA-256: 0e15efeaade46f2616e7126ecef9055d895432a174dac36d2f75c7010d9b70cc
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 critical finding indicating potential malicious execution. The presence of dangerous formula APIs like RUN further supports this. While the exact payload is not discernible from the truncated macro content, the Auto_Open function is designed to execute code upon opening the workbook, likely leading to further 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) 6600 bytes
SHA-256: ddecb38ad2dae6015d0bb047e72f34770088147af51ddec483af05ff1a8e9a53
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  KDyHp
' 0018     25 LABEL : Cell Value, String Constant - anwESGbrKr len=0 
' 0018     23 LABEL : Cell Value, String Constant - ArLGZDUe len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E141 
' 0018     22 LABEL : Cell Value, String Constant - BgtsIvg len=0 
' 0018     22 LABEL : Cell Value, String Constant - gpuUQkQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - hvoImUPWDOZb len=0 
' 0018     27 LABEL : Cell Value, String Constant - iIarBONgqBgD len=0 
' 0018     23 LABEL : Cell Value, String Constant - JwpvhJpY len=0 
' 0018     20 LABEL : Cell Value, String Constant - lhHli len=0 
' 0018     24 LABEL : Cell Value, String Constant - MUiFbhbFu len=0 
' 0018     25 LABEL : Cell Value, String Constant - MVHdDsvqjr len=0 
' 0018     20 LABEL : Cell Value, String Constant - MvkFP len=0 
' 0018     22 LABEL : Cell Value, String Constant - oIxsAQZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - QFfyp len=0 
' 0018     22 LABEL : Cell Value, String Constant - QSMTUHD len=0 
' 0018     20 LABEL : Cell Value, String Constant - toqIo len=0 
' 0018     24 LABEL : Cell Value, String Constant - TTkqNavot len=0 
' 0018     23 LABEL : Cell Value, String Constant - uGWbXnsZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - xkpfVEUu len=0 
' 0018     27 LABEL : Cell Value, String Constant - YABaHWlPlWAI len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZCsAyPNGf 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 LABE
... (truncated)

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