Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d3a2b5747e4ba22c…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:40:53 Authoring application: Microsoft Excel First seen: 2021-06-30
MD5: 69a3c7958184588ffaa786f567a21ecc SHA-1: 58dcfeecb826881368cec05c1d16bf4ce06fbb1a SHA-256: d3a2b5747e4ba22ce720c43f1677c1a2afdfac09a27a8f8cfa84fd4bb9d8b036
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code upon opening the document. The macro sheet contains references to dangerous formula APIs, specifically 'RUN', suggesting it is designed to execute arbitrary commands. The macro's purpose is likely to download and execute a second-stage payload, although no specific URLs or commands were extracted.

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) 6520 bytes
SHA-256: 419c76ee19903a3123c05654d8f63ae82d90877e7fef8863d465e65485ab7759
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 -  QPCFv
' 0018     20 LABEL : Cell Value, String Constant - ALjXj len=0 
' 0018     24 LABEL : Cell Value, String Constant - atLbewtWz len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G174 
' 0018     20 LABEL : Cell Value, String Constant - avKHD len=0 
' 0018     25 LABEL : Cell Value, String Constant - AYGKcHVsrJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - bvbVYz len=0 
' 0018     21 LABEL : Cell Value, String Constant - DAxWmN len=0 
' 0018     26 LABEL : Cell Value, String Constant - dOxEoIHFMsr len=0 
' 0018     22 LABEL : Cell Value, String Constant - DYynYjN len=0 
' 0018     27 LABEL : Cell Value, String Constant - fGPfasIQLEvf len=0 
' 0018     22 LABEL : Cell Value, String Constant - gDHPGgs len=0 
' 0018     20 LABEL : Cell Value, String Constant - gnwpX len=0 
' 0018     20 LABEL : Cell Value, String Constant - lcjIY len=0 
' 0018     26 LABEL : Cell Value, String Constant - msbukHwfZBI len=0 
' 0018     26 LABEL : Cell Value, String Constant - oXbpYBGEBEE len=0 
' 0018     26 LABEL : Cell Value, String Constant - QsQeEnwZthR len=0 
' 0018     23 LABEL : Cell Value, String Constant - rFQIKWbs len=0 
' 0018     26 LABEL : Cell Value, String Constant - uEOqhTruqEO len=0 
' 0018     22 LABEL : Cell Value, String Constant - Uhtyxzx len=0 
' 0018     27 LABEL : Cell Value, String Constant - xUWuoLhjTtxK len=0 
' 0018     27 LABEL : Cell Value, String Constant - zbIAULNliWfi 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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