Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e9bf66acd4941b22…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:40:16 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: cd8e2640ae347e9066a730407e4de211 SHA-1: c80255461a32aa68fdbfe18442e6f13256210354 SHA-256: e9bf66acd4941b22a83f9685daa5a47c93ea1a8d5b59d50c97ab0a9b23b1ffed
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 function, which is a known technique for executing malicious code upon opening the document. The presence of dangerous formula APIs in the Auto_Open macro indicates an intent to perform harmful actions. Without further script content, the exact payload and execution method remain unclear, leading to an unknown family classification.

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) 6609 bytes
SHA-256: 0b06950eb256ee15864ebd832f313d109788be4a266e4e41151292cbd5b3fa51
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 -  DME
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D184 
' 0018     22 LABEL : Cell Value, String Constant - BglKoni len=0 
' 0018     24 LABEL : Cell Value, String Constant - bQLpAtigP len=0 
' 0018     23 LABEL : Cell Value, String Constant - CFSidtdE len=0 
' 0018     25 LABEL : Cell Value, String Constant - EOCqFmURtL len=0 
' 0018     27 LABEL : Cell Value, String Constant - fWzDnUQzUjdS len=0 
' 0018     23 LABEL : Cell Value, String Constant - jKqQqNdu len=0 
' 0018     26 LABEL : Cell Value, String Constant - KiSakSXpyoN len=0 
' 0018     21 LABEL : Cell Value, String Constant - NNaula len=0 
' 0018     25 LABEL : Cell Value, String Constant - OlydPkLFVO len=0 
' 0018     27 LABEL : Cell Value, String Constant - PaNASCsgjKsD len=0 
' 0018     24 LABEL : Cell Value, String Constant - pQqqtAssl len=0 
' 0018     27 LABEL : Cell Value, String Constant - qHeOkjDOguSp len=0 
' 0018     22 LABEL : Cell Value, String Constant - QUUIipC len=0 
' 0018     22 LABEL : Cell Value, String Constant - ThhnYWq len=0 
' 0018     25 LABEL : Cell Value, String Constant - umDFyTAuLf len=0 
' 0018     26 LABEL : Cell Value, String Constant - UwQxUsfbitZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - VYRmXgH len=0 
' 0018     24 LABEL : Cell Value, String Constant - wLImxGnFZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - XcUDRC len=0 
' 0018     27 LABEL : Cell Value, String Constant - yZrkXeJCNDaj 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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