Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0f8f472eb9c6eeb9…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:56 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: 98f602d43cec327ed82ac15c18376fa3 SHA-1: 0a58c67325cf822d4a02b2330af38bd6d0603689 SHA-256: 0f8f472eb9c6eeb97fa2d49d77573bb5cc8ff271eef54a1670c56f790aae7d56
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 the macro sheet will execute automatically upon opening. The presence of dangerous formula APIs in the Auto_Open macro suggests it is designed to execute arbitrary code, likely leading to further exploitation.

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) 6564 bytes
SHA-256: 2507dc1ea4efa2cfcdb249a06496ed377c6676ad2ecdeb8589e8c49d474a7a5e
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 -  bqdMqJkzg
' 0018     21 LABEL : Cell Value, String Constant - aPmHgK len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A138 
' 0018     20 LABEL : Cell Value, String Constant - CqCBV len=0 
' 0018     20 LABEL : Cell Value, String Constant - cUGXl len=0 
' 0018     23 LABEL : Cell Value, String Constant - cWrgugBF len=0 
' 0018     20 LABEL : Cell Value, String Constant - EGPFh len=0 
' 0018     22 LABEL : Cell Value, String Constant - EIyIjPf len=0 
' 0018     24 LABEL : Cell Value, String Constant - gdkJkSOGB len=0 
' 0018     26 LABEL : Cell Value, String Constant - IDdtFSUnvJb len=0 
' 0018     22 LABEL : Cell Value, String Constant - JdVtzJo len=0 
' 0018     23 LABEL : Cell Value, String Constant - kdtNBWPg len=0 
' 0018     27 LABEL : Cell Value, String Constant - mJoSEcOUODOu len=0 
' 0018     27 LABEL : Cell Value, String Constant - nGGVbyBgKaqk len=0 
' 0018     27 LABEL : Cell Value, String Constant - PktEMYbZlnce len=0 
' 0018     25 LABEL : Cell Value, String Constant - qZIHmSreOB len=0 
' 0018     20 LABEL : Cell Value, String Constant - rcmTV len=0 
' 0018     22 LABEL : Cell Value, String Constant - vhxCCtJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - WFlxGNxKYib len=0 
' 0018     26 LABEL : Cell Value, String Constant - YHuwLDZEMiY len=0 
' 0018     26 LABEL : Cell Value, String Constant - yoBsNdmdwgD len=0 
' 0018     26 LABEL : Cell Value, String Constant - zQQJlnKMZok 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
' 00
... (truncated)

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