Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f06e71d25c161c71…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:04 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: f0d95dbc954b8a400d05d10ff5476e14 SHA-1: 752339286fd3cbe563075cfa58a5e9d6e3cb9c51 SHA-256: f06e71d25c161c715e8ddc5bb6a33138e7236a95fd7626c0a91bf5ebc6c12a3f
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 technique for executing malicious code upon opening the document. The macro sheet contains a reference to a dangerous function, likely 'RUN', which is used to execute external commands or download payloads. No specific URLs or hashes were extracted, but the presence of Auto_Open strongly suggests a downloader or initial execution stage.

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) 6579 bytes
SHA-256: 387bd606c31ff5067de0abaf1c23832602bb7e0caa3c6ef8a9911a40eaa5148c
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 -  QrOQsNpRjo
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E159 
' 0018     22 LABEL : Cell Value, String Constant - CaddjgR len=0 
' 0018     24 LABEL : Cell Value, String Constant - DOPRPlDDw len=0 
' 0018     25 LABEL : Cell Value, String Constant - EMwgJGgqUD len=0 
' 0018     24 LABEL : Cell Value, String Constant - epAPKtcaD len=0 
' 0018     22 LABEL : Cell Value, String Constant - fZcdGaQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - HrCVfkars len=0 
' 0018     23 LABEL : Cell Value, String Constant - kBxgYTJX len=0 
' 0018     27 LABEL : Cell Value, String Constant - KiqfNbhLfVTt len=0 
' 0018     21 LABEL : Cell Value, String Constant - KQpTAs len=0 
' 0018     21 LABEL : Cell Value, String Constant - lhytan len=0 
' 0018     26 LABEL : Cell Value, String Constant - MCTQBzsHjiX len=0 
' 0018     20 LABEL : Cell Value, String Constant - NEYaY len=0 
' 0018     24 LABEL : Cell Value, String Constant - RgcUrergm len=0 
' 0018     25 LABEL : Cell Value, String Constant - RIHuauNoZT len=0 
' 0018     23 LABEL : Cell Value, String Constant - rWyPVwQF len=0 
' 0018     23 LABEL : Cell Value, String Constant - ScjTYKNI len=0 
' 0018     27 LABEL : Cell Value, String Constant - TdDxAIiqciFb len=0 
' 0018     20 LABEL : Cell Value, String Constant - tOiqM len=0 
' 0018     21 LABEL : Cell Value, String Constant - wqjvbF len=0 
' 0018     20 LABEL : Cell Value, String Constant - ykZsG 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 
... (truncated)

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