Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c9de8570313f795a…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:59 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 42c0a809c97538394de0ce8b51d85693 SHA-1: 3b5412b064f0bd9992507eb16dc4ecfbe088d2ec SHA-256: c9de8570313f795acdc54f9f580ac6cdf8efa56bb2f79c027a9b98c65540e3a1
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, which is a common technique for executing malicious code upon opening the document. The macro sheet contains a dangerous formula API call, specifically 'RUN', suggesting it is designed to execute an external command or payload. No specific URLs or further payloads were extracted, but the intent is clearly to achieve code 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) 6507 bytes
SHA-256: 472ca5050af5d044d819837f8e34dbbe8a69c2310ac5945023a4369959266ab5
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  zvqZS
' 0018     26 LABEL : Cell Value, String Constant - AuBtyCnZiqp len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B147 
' 0018     27 LABEL : Cell Value, String Constant - baAOkdVVZUQl len=0 
' 0018     21 LABEL : Cell Value, String Constant - bolWYj len=0 
' 0018     24 LABEL : Cell Value, String Constant - bXJzCGaDH len=0 
' 0018     20 LABEL : Cell Value, String Constant - CyrXR len=0 
' 0018     24 LABEL : Cell Value, String Constant - hsZBhIPfT len=0 
' 0018     23 LABEL : Cell Value, String Constant - jlawXNuO len=0 
' 0018     26 LABEL : Cell Value, String Constant - KmBHpNOnLJe len=0 
' 0018     25 LABEL : Cell Value, String Constant - lGWiCiXAsi len=0 
' 0018     22 LABEL : Cell Value, String Constant - naVuduP len=0 
' 0018     22 LABEL : Cell Value, String Constant - NTddGmT len=0 
' 0018     26 LABEL : Cell Value, String Constant - oeqvkgllhgk len=0 
' 0018     20 LABEL : Cell Value, String Constant - OvApD len=0 
' 0018     23 LABEL : Cell Value, String Constant - pxRArQTO len=0 
' 0018     26 LABEL : Cell Value, String Constant - PzMTrWZEvoy len=0 
' 0018     25 LABEL : Cell Value, String Constant - ReXpvcSavQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - SDxuJZkfOM len=0 
' 0018     23 LABEL : Cell Value, String Constant - UdmbYQrP len=0 
' 0018     26 LABEL : Cell Value, String Constant - wPsybDCsPbi len=0 
' 0018     24 LABEL : Cell Value, String Constant - yQbTzkSXF 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
' 0
... (truncated)

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