Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3dcf79de4779775f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:58 Authoring application: Microsoft Excel
MD5: 4272282d0702831a9b5ddd53dd11a9b5 SHA-1: 9ddf5bf98a9ccdc41d9f1db284c50c75e3ecab72 SHA-256: 3dcf79de4779775ffbe8f1e70de7c5c6c309660440318584686d3657bf6f3638
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 sheet, identified by critical heuristics detecting an OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN. The Auto_Open macro is configured to execute, and the presence of 'RUN=0' suggests it is intended to launch an external process. This indicates a likely pattern of downloading and executing a second-stage payload.

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
dea2c364f156d1e21a823bd8203c152c0f722ac20552611707d8f177fe36fdeb		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6574 bytes
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 -  EOq
' 0018     27 LABEL : Cell Value, String Constant - AbMBmBwOJECf len=0 
' 0018     24 LABEL : Cell Value, String Constant - akxyjgxfI len=0 
' 0018     20 LABEL : Cell Value, String Constant - apvHP len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A167 
' 0018     21 LABEL : Cell Value, String Constant - dfwxll len=0 
' 0018     23 LABEL : Cell Value, String Constant - dQEOcYtk len=0 
' 0018     25 LABEL : Cell Value, String Constant - ErhujUBHtz len=0 
' 0018     26 LABEL : Cell Value, String Constant - FMFYnRxmsFc len=0 
' 0018     23 LABEL : Cell Value, String Constant - FrBhRFeS len=0 
' 0018     23 LABEL : Cell Value, String Constant - GineFdiz len=0 
' 0018     22 LABEL : Cell Value, String Constant - inJAOoQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - MEyIorsV len=0 
' 0018     27 LABEL : Cell Value, String Constant - NqwNLUNgRiWJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - OXcvdcJEDn len=0 
' 0018     27 LABEL : Cell Value, String Constant - OygxEfVGNsVw len=0 
' 0018     22 LABEL : Cell Value, String Constant - phHMsfL len=0 
' 0018     21 LABEL : Cell Value, String Constant - PQtwcs len=0 
' 0018     24 LABEL : Cell Value, String Constant - VTESZPjNK len=0 
' 0018     24 LABEL : Cell Value, String Constant - WTGvSDbhe len=0 
' 0018     26 LABEL : Cell Value, String Constant - xmGmaPaHBQD len=0 
' 0018     22 LABEL : Cell Value, String Constant - zLraVQS 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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