Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4453e49870c512ae…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:45:06 Authoring application: Microsoft Excel First seen: 2021-06-04
MD5: c95f8406329cf74597dedb17310293b8 SHA-1: 916092ab5c06f60ac3e153f632404d086a97b0cb SHA-256: 4453e49870c512aeb10fac07673bc8a83ff2a686a7e78d5562bb620ab75b1052
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating potential automatic execution of malicious code upon opening. The presence of dangerous formula APIs further increases the risk. This suggests the file is likely a malicious document delivered as a spearphishing attachment, designed to run arbitrary code via XLM macros.

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) 6461 bytes
SHA-256: a70a2a51b8e08204ec73b6b8a571a174e3882c3974517a767bf842e8ececf472
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  wil
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F142 
' 0018     27 LABEL : Cell Value, String Constant - DDeFVZRupEUj len=0 
' 0018     22 LABEL : Cell Value, String Constant - DnkPSNH len=0 
' 0018     24 LABEL : Cell Value, String Constant - EbfKgdtEz len=0 
' 0018     20 LABEL : Cell Value, String Constant - eRoFU len=0 
' 0018     23 LABEL : Cell Value, String Constant - HcLnZGPy len=0 
' 0018     22 LABEL : Cell Value, String Constant - jQSLyCl len=0 
' 0018     24 LABEL : Cell Value, String Constant - KxTCtTpuc len=0 
' 0018     21 LABEL : Cell Value, String Constant - MVWGai len=0 
' 0018     26 LABEL : Cell Value, String Constant - nKGwphViFXm len=0 
' 0018     20 LABEL : Cell Value, String Constant - orSPb len=0 
' 0018     24 LABEL : Cell Value, String Constant - pevYjJkHh len=0 
' 0018     20 LABEL : Cell Value, String Constant - pmEFe len=0 
' 0018     27 LABEL : Cell Value, String Constant - PzSQYZRTpJWT len=0 
' 0018     22 LABEL : Cell Value, String Constant - QclryoU len=0 
' 0018     22 LABEL : Cell Value, String Constant - RVWIrFl len=0 
' 0018     26 LABEL : Cell Value, String Constant - SxScpBLIQTl len=0 
' 0018     23 LABEL : Cell Value, String Constant - UWqIHGRx len=0 
' 0018     23 LABEL : Cell Value, String Constant - UZsgNvej len=0 
' 0018     21 LABEL : Cell Value, String Constant - VEgpah len=0 
' 0018     24 LABEL : Cell Value, String Constant - VeRHquWvf 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 LABELSST
... (truncated)

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