Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a004246769cd4ffc…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:44:43 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: f51a095dc0c9d5dd3d3f47d965334100 SHA-1: 89887dcfbdff67330c1d53c81c002992772eb936 SHA-256: a004246769cd4ffc65d1f0f43cc390818614d4ed2b4fe6e90c1a48314b91e774
140 Risk Score

Malware Insights

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

The file is an Excel workbook containing Excel 4.0 (XLM) macros. The critical heuristic firings indicate the presence of an Auto_Open defined name, which is a common technique for automatically executing malicious code when the workbook is opened. The XLM macros also utilize dangerous formula APIs, suggesting an intent to perform actions beyond standard spreadsheet operations.

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) 6770 bytes
SHA-256: dab06ceae10d75a48d88c7fdc42b184a605b9584d2ea39638be081b52c689ca8
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 -  BfOgth
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G153 
' 0018     21 LABEL : Cell Value, String Constant - bZOgBN len=0 
' 0018     20 LABEL : Cell Value, String Constant - DEUqt len=0 
' 0018     26 LABEL : Cell Value, String Constant - EcbLywDXCYY len=0 
' 0018     25 LABEL : Cell Value, String Constant - FRFBdwExOa len=0 
' 0018     22 LABEL : Cell Value, String Constant - ftDmTEc len=0 
' 0018     23 LABEL : Cell Value, String Constant - FtQZwOkc len=0 
' 0018     20 LABEL : Cell Value, String Constant - FXPvU len=0 
' 0018     23 LABEL : Cell Value, String Constant - HWoUvGjw len=0 
' 0018     23 LABEL : Cell Value, String Constant - irzyvVVQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - nClKYlYSgM len=0 
' 0018     27 LABEL : Cell Value, String Constant - PgURJeiRIHzZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - ppXqpqcZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - PxSklyxEs len=0 
' 0018     24 LABEL : Cell Value, String Constant - pZlvRGYdi len=0 
' 0018     25 LABEL : Cell Value, String Constant - QdiOgcHNMy len=0 
' 0018     27 LABEL : Cell Value, String Constant - SLDHSvpwHuoS len=0 
' 0018     24 LABEL : Cell Value, String Constant - tXlkoyaQU len=0 
' 0018     23 LABEL : Cell Value, String Constant - VhfSVptg len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZDRTIxH len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZgWUpiD 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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