Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b7edab6aa1db14fc…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:28:21 Authoring application: Microsoft Excel First seen: 2021-09-15
MD5: f660b487ca2bd2df8c740ca29c55a181 SHA-1: afd376996874fe4b9452b5c208b63ce6b0cc8324 SHA-256: b7edab6aa1db14fc8b4f2f0b2f36272b83dc4f37fdc92141f34b602381c2f814
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, specifically an Auto_Open function, which is a common technique for executing malicious code. The `RUN=0` and `risky-formula=3` findings suggest the macro attempts to run external commands or functions. While no specific IOCs like URLs or hashes were extracted, the presence of Auto_Open macros strongly suggests an intent to execute arbitrary code.

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) 6611 bytes
SHA-256: 4ac4eb17ffc97af627dcd510684cd3191b898aca7753b1fdc2247e8ec3a49293
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  qIVyRBevTp
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F189 
' 0018     22 LABEL : Cell Value, String Constant - ckKMKQD len=0 
' 0018     26 LABEL : Cell Value, String Constant - FaaCoxeSTLH len=0 
' 0018     26 LABEL : Cell Value, String Constant - GPkNMLdLccg len=0 
' 0018     23 LABEL : Cell Value, String Constant - HLMbMRFG len=0 
' 0018     24 LABEL : Cell Value, String Constant - IFnOzejAW len=0 
' 0018     20 LABEL : Cell Value, String Constant - iNywr len=0 
' 0018     23 LABEL : Cell Value, String Constant - iyqbKljl len=0 
' 0018     20 LABEL : Cell Value, String Constant - jOmvp len=0 
' 0018     22 LABEL : Cell Value, String Constant - lUnawWY len=0 
' 0018     24 LABEL : Cell Value, String Constant - mitsRDGMP len=0 
' 0018     20 LABEL : Cell Value, String Constant - mPnjI len=0 
' 0018     26 LABEL : Cell Value, String Constant - PhdkcvdAPpd len=0 
' 0018     26 LABEL : Cell Value, String Constant - PIPCEOevQjl len=0 
' 0018     26 LABEL : Cell Value, String Constant - PnmxAtlhaJY len=0 
' 0018     23 LABEL : Cell Value, String Constant - PQAMcxOi len=0 
' 0018     27 LABEL : Cell Value, String Constant - SwuflFEpvZWb len=0 
' 0018     26 LABEL : Cell Value, String Constant - vOzfsdPQrpY len=0 
' 0018     20 LABEL : Cell Value, String Constant - XlogG len=0 
' 0018     21 LABEL : Cell Value, String Constant - xVmopS len=0 
' 0018     20 LABEL : Cell Value, String Constant - XZASl 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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