Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c869672a9802475e…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:17 Authoring application: Microsoft Excel First seen: 2021-06-17
MD5: 2bea7ee2de7a6d1646ffcb645ece8a39 SHA-1: ef7d063e29ea32f8a8a483ed5eb6ed04785d9cda SHA-256: c869672a9802475e8b24a24266617c5892d1679d88ef2a607c9754701c7ed6a8
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 sheet containing an Auto_Open function, which is a critical indicator of malicious intent. This function is designed to execute arbitrary code upon opening the workbook, commonly used to download and execute further malware. The presence of dangerous formula APIs further supports this assessment.

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) 6463 bytes
SHA-256: 4af13cf9a5c7c4d1c8e7aaceb4360a74c982539df1c0ad56bb4b153d11d2b3f2
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  vPRMlqF
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E154 
' 0018     20 LABEL : Cell Value, String Constant - BVeGD len=0 
' 0018     24 LABEL : Cell Value, String Constant - BwVClEOAp len=0 
' 0018     22 LABEL : Cell Value, String Constant - cPgWmxH len=0 
' 0018     24 LABEL : Cell Value, String Constant - eewsdKfiW len=0 
' 0018     22 LABEL : Cell Value, String Constant - eQDaLMd len=0 
' 0018     21 LABEL : Cell Value, String Constant - fmHLlU len=0 
' 0018     24 LABEL : Cell Value, String Constant - fTiLaRNMG len=0 
' 0018     23 LABEL : Cell Value, String Constant - gcXnfyul len=0 
' 0018     27 LABEL : Cell Value, String Constant - gwizfQgtEZwa len=0 
' 0018     23 LABEL : Cell Value, String Constant - haUmogUF len=0 
' 0018     23 LABEL : Cell Value, String Constant - ImPggEzn len=0 
' 0018     26 LABEL : Cell Value, String Constant - kRhZwaJSdax len=0 
' 0018     20 LABEL : Cell Value, String Constant - nAPyI len=0 
' 0018     20 LABEL : Cell Value, String Constant - psjMq len=0 
' 0018     23 LABEL : Cell Value, String Constant - uhuqXxhO len=0 
' 0018     20 LABEL : Cell Value, String Constant - VDoJl len=0 
' 0018     23 LABEL : Cell Value, String Constant - vfbclrKY len=0 
' 0018     23 LABEL : Cell Value, String Constant - vFpoczbo len=0 
' 0018     23 LABEL : Cell Value, String Constant - zdYaZfej len=0 
' 0018     24 LABEL : Cell Value, String Constant - zocUwXLBB 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     10 LABELSST :
... (truncated)

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