Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 dae93ef3731fc01f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:47:11 Authoring application: Microsoft Excel First seen: 2021-09-17
MD5: 309a74a882450e2eed166456f2c7507c SHA-1: fc297cee0c7b3209eeda79e62f7d05b45a38cdec SHA-256: dae93ef3731fc01f2f9ffd238420466e748a160a303df3cd2fc50f9ce56b7c07
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 known technique for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN further indicates malicious intent. While the exact payload is not discernible from the provided evidence, the mechanism points to an attempt 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) 6679 bytes
SHA-256: 6b69d45f187ff634c7187bff597384996266dba2356f6a0e8d7011fc32021212
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  wbFmjG
' 0018     22 LABEL : Cell Value, String Constant - afsSmeM len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C144 
' 0018     27 LABEL : Cell Value, String Constant - bORXhtmZQLHt len=0 
' 0018     26 LABEL : Cell Value, String Constant - BThkqLjwOhH len=0 
' 0018     21 LABEL : Cell Value, String Constant - EoIFpE len=0 
' 0018     20 LABEL : Cell Value, String Constant - fAUNC len=0 
' 0018     24 LABEL : Cell Value, String Constant - fLmvBXyhM len=0 
' 0018     26 LABEL : Cell Value, String Constant - HhJGxELNYiS len=0 
' 0018     26 LABEL : Cell Value, String Constant - idTzrMhGTJb len=0 
' 0018     26 LABEL : Cell Value, String Constant - JdTTgtNzGqq len=0 
' 0018     22 LABEL : Cell Value, String Constant - kdQKKeh len=0 
' 0018     23 LABEL : Cell Value, String Constant - lEAyyeXd len=0 
' 0018     21 LABEL : Cell Value, String Constant - NuHdhu len=0 
' 0018     26 LABEL : Cell Value, String Constant - rCrVdRhESnz len=0 
' 0018     27 LABEL : Cell Value, String Constant - regwRDicCJYX len=0 
' 0018     22 LABEL : Cell Value, String Constant - sxxTRFk len=0 
' 0018     21 LABEL : Cell Value, String Constant - wCmTZD len=0 
' 0018     27 LABEL : Cell Value, String Constant - xVXRRGXwBDan len=0 
' 0018     23 LABEL : Cell Value, String Constant - YYTVhPpV len=0 
' 0018     23 LABEL : Cell Value, String Constant - zCoTzuCQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - zodeZWl 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
' 00f
... (truncated)

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