Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4e0229033e6e6a47…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:24 Authoring application: Microsoft Excel First seen: 2021-05-26
MD5: 1a0b019f61916315e6694ebae28f1283 SHA-1: 634bada7c36a6aed61da2a2cc2da82fffb621758 SHA-256: 4e0229033e6e6a47b02f3362ea0265029434de19e446ba85814e37b83e8828b2
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 critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely downloading and running a second-stage payload. No specific family could be identified, but the technique is common for initial execution.

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) 6426 bytes
SHA-256: e2378600f755d5bf4d8da2334c3dca6a043abcd1f5b4beac5f7f3b90744b298b
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 -  Xwi
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G186 
' 0018     25 LABEL : Cell Value, String Constant - bfkYgoXYlk len=0 
' 0018     20 LABEL : Cell Value, String Constant - celGd len=0 
' 0018     26 LABEL : Cell Value, String Constant - chBeryCXvgS len=0 
' 0018     21 LABEL : Cell Value, String Constant - FSSjoY len=0 
' 0018     20 LABEL : Cell Value, String Constant - HdWxX len=0 
' 0018     21 LABEL : Cell Value, String Constant - IEJdny len=0 
' 0018     26 LABEL : Cell Value, String Constant - jCNhFUgXzux len=0 
' 0018     26 LABEL : Cell Value, String Constant - kcMXsPCrbAb len=0 
' 0018     24 LABEL : Cell Value, String Constant - LTTPqjXaB len=0 
' 0018     26 LABEL : Cell Value, String Constant - MEAaTPhQUva len=0 
' 0018     25 LABEL : Cell Value, String Constant - MfdvzIEzCv len=0 
' 0018     22 LABEL : Cell Value, String Constant - NdORUCk len=0 
' 0018     27 LABEL : Cell Value, String Constant - OVfIjOSkQvIp len=0 
' 0018     26 LABEL : Cell Value, String Constant - oXrkQuOmRWx len=0 
' 0018     27 LABEL : Cell Value, String Constant - PHFQXafTfHoO len=0 
' 0018     27 LABEL : Cell Value, String Constant - punoCOrervAp len=0 
' 0018     25 LABEL : Cell Value, String Constant - senlVxdQen len=0 
' 0018     26 LABEL : Cell Value, String Constant - SRHaIEtlMXq len=0 
' 0018     20 LABEL : Cell Value, String Constant - VUSQE len=0 
' 0018     22 LABEL : Cell Value, String Constant - XvjaWLz 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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