Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5d356797e8c3c97e…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:41:44 Authoring application: Microsoft Excel First seen: 2021-06-04
MD5: 970e669497b687ce51ea9058723049b3 SHA-1: 33aa3448591dc00d489490a040cd49b7bacd4d93 SHA-256: 5d356797e8c3c97e81101afae62dc2f245a988f3f9d58eb4302e102e95c820f7
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The critical heuristics indicate the presence of Excel 4.0 (XLM) macros with an Auto_Open entry, which is a common method for executing malicious code when a workbook is opened. The `RUN` formula API was identified, suggesting the macro is designed to execute a command or payload. No specific family could be identified from the available evidence.

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) 6841 bytes
SHA-256: d6a86e920b942ae73adb066947c76d99e3199d8b5b139641088722010b1451f4
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  nUDRqAtJ
' 0018     23 LABEL : Cell Value, String Constant - aHVtEbYP len=0 
' 0018     24 LABEL : Cell Value, String Constant - aoMssatQI len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A183 
' 0018     26 LABEL : Cell Value, String Constant - BsAelPzAzfK len=0 
' 0018     23 LABEL : Cell Value, String Constant - cXzzoaEl len=0 
' 0018     22 LABEL : Cell Value, String Constant - ebBTiHJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - hFjqnrIuBb len=0 
' 0018     22 LABEL : Cell Value, String Constant - JMBPpnc len=0 
' 0018     25 LABEL : Cell Value, String Constant - keYYiohGda len=0 
' 0018     24 LABEL : Cell Value, String Constant - lLIUuYQVP len=0 
' 0018     24 LABEL : Cell Value, String Constant - mqnwKrBfq len=0 
' 0018     25 LABEL : Cell Value, String Constant - NmqiLMGFZT len=0 
' 0018     24 LABEL : Cell Value, String Constant - qaAuXppfr len=0 
' 0018     26 LABEL : Cell Value, String Constant - QcPnaonHRsk len=0 
' 0018     26 LABEL : Cell Value, String Constant - tgZoqWgpPAA len=0 
' 0018     27 LABEL : Cell Value, String Constant - uROesBqLKNxF len=0 
' 0018     20 LABEL : Cell Value, String Constant - uwZYa len=0 
' 0018     25 LABEL : Cell Value, String Constant - WaqnqAEwBi len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZcpqQqVNQlC len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZfSjzwtcL len=0 
' 0018     20 LABEL : Cell Value, String Constant - zMHQX 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/ S
... (truncated)

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