Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 506c26671d74d6cc…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:47 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: 409be7b678a04173b7f3f0ebeca44052 SHA-1: 5753c5921aeac3669b39e1c43d896c521474d261 SHA-256: 506c26671d74d6cc2bfc0cbd64fa6a9d5eebc59522b30f86b6232a67687f363f
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

This Excel file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding. The macros utilize dangerous formula APIs, including a RUN function, indicating an attempt to execute arbitrary code. The presence of an Auto_Open entry strongly suggests the macro will execute automatically when the workbook is opened, leading to potential 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) 6510 bytes
SHA-256: 4ab8a8e71b059fd838f2bb91e24113a66841f0093dafde3bbb460c496694eef7
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 -  MpRdLL
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A164 
' 0018     23 LABEL : Cell Value, String Constant - dBRAeqYK len=0 
' 0018     27 LABEL : Cell Value, String Constant - DNCeJSUaUllo len=0 
' 0018     24 LABEL : Cell Value, String Constant - DNeaOlvQR len=0 
' 0018     26 LABEL : Cell Value, String Constant - dyCsuEsVyZg len=0 
' 0018     24 LABEL : Cell Value, String Constant - ekXyHYajH len=0 
' 0018     20 LABEL : Cell Value, String Constant - GuXqf len=0 
' 0018     26 LABEL : Cell Value, String Constant - KBwilfgaTzR len=0 
' 0018     25 LABEL : Cell Value, String Constant - kKzFmEKaMw len=0 
' 0018     27 LABEL : Cell Value, String Constant - LFSZrfNYvbwK len=0 
' 0018     23 LABEL : Cell Value, String Constant - MyMnBfgb len=0 
' 0018     27 LABEL : Cell Value, String Constant - qByfMvneabEo len=0 
' 0018     21 LABEL : Cell Value, String Constant - QJrmFT len=0 
' 0018     20 LABEL : Cell Value, String Constant - qzaZq len=0 
' 0018     26 LABEL : Cell Value, String Constant - raOUXGTSZnu len=0 
' 0018     25 LABEL : Cell Value, String Constant - RPJqfKcize len=0 
' 0018     23 LABEL : Cell Value, String Constant - srCKjoaI len=0 
' 0018     26 LABEL : Cell Value, String Constant - wfescdPnhiT len=0 
' 0018     21 LABEL : Cell Value, String Constant - xSYqSh len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZkwblgFED len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZxTHjj 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
'
... (truncated)

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