Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0fa6988ea0d88bfc…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:27 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: d52085bb02ea07570c5529af4a6cda76 SHA-1: a526252f3e4a16eaa1c5c298d44d07b78e18059a SHA-256: 0fa6988ea0d88bfcb3d02bc398bfec197aa16d1f3b9d182e99b3b02b3a463823
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) 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 to download and run a second-stage payload. No specific family could be identified.

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) 6763 bytes
SHA-256: 73270ffb70773b54243d99370d32d323b0d90a2c364ccc16315632342431f904
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 -  Stqxvs
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B150 
' 0018     25 LABEL : Cell Value, String Constant - BNMiKasALL len=0 
' 0018     23 LABEL : Cell Value, String Constant - bQBvfaIx len=0 
' 0018     22 LABEL : Cell Value, String Constant - BwoMTMG len=0 
' 0018     24 LABEL : Cell Value, String Constant - dEvpwMYRo len=0 
' 0018     23 LABEL : Cell Value, String Constant - eSHOAVtl len=0 
' 0018     26 LABEL : Cell Value, String Constant - esrgtEBNvRh len=0 
' 0018     24 LABEL : Cell Value, String Constant - FZFaTtexu len=0 
' 0018     25 LABEL : Cell Value, String Constant - GfrpRBszCc len=0 
' 0018     23 LABEL : Cell Value, String Constant - irLXSaie len=0 
' 0018     25 LABEL : Cell Value, String Constant - iWOzCYQMlf len=0 
' 0018     20 LABEL : Cell Value, String Constant - JeWAI len=0 
' 0018     27 LABEL : Cell Value, String Constant - NlOsQyHvLJqS len=0 
' 0018     25 LABEL : Cell Value, String Constant - nqnyqSBaID len=0 
' 0018     26 LABEL : Cell Value, String Constant - OcgEsGRAnFr len=0 
' 0018     25 LABEL : Cell Value, String Constant - pWGlzbUFug len=0 
' 0018     25 LABEL : Cell Value, String Constant - rOvhZbGrEm len=0 
' 0018     24 LABEL : Cell Value, String Constant - rVAaHrkgC len=0 
' 0018     23 LABEL : Cell Value, String Constant - tqZooWVW len=0 
' 0018     24 LABEL : Cell Value, String Constant - XXugZEWwG len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZImDDbyVVvO 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/
... (truncated)

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