Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0ccf3596f2d9feb7…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:44:20 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: d1315d6a7f0891f7cd0c7e6911947539 SHA-1: a982a9f01f646e74d2a5a0ec9f426885bfd8b8d5 SHA-256: 0ccf3596f2d9feb757a589b63a24a3002940b5187fb28ec48d7fbe1fe14ccf97
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 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 downloading and running a second-stage payload. No specific family could be identified, but the technique is common for initial 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) 6698 bytes
SHA-256: b60ecd12646933c69486af773817092e0b9ec872fc8cf5ea6f0ac9d3a60ff1bf
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  tvVYPazrsO
' 0018     22 LABEL : Cell Value, String Constant - agBqJqj len=0 
' 0018     24 LABEL : Cell Value, String Constant - anCfIffax len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G143 
' 0018     22 LABEL : Cell Value, String Constant - FneWoJM len=0 
' 0018     20 LABEL : Cell Value, String Constant - Fzpbd len=0 
' 0018     24 LABEL : Cell Value, String Constant - gSrnwxQXv len=0 
' 0018     24 LABEL : Cell Value, String Constant - iAsmqNDjf len=0 
' 0018     27 LABEL : Cell Value, String Constant - IvQXSspqPHgx len=0 
' 0018     26 LABEL : Cell Value, String Constant - KCWjgFiNQcg len=0 
' 0018     22 LABEL : Cell Value, String Constant - kzkODea len=0 
' 0018     20 LABEL : Cell Value, String Constant - NaDvB len=0 
' 0018     23 LABEL : Cell Value, String Constant - ohWuTlHW len=0 
' 0018     27 LABEL : Cell Value, String Constant - OrMtBzvuiTuk len=0 
' 0018     25 LABEL : Cell Value, String Constant - qljctinSEg len=0 
' 0018     21 LABEL : Cell Value, String Constant - sMRJPw len=0 
' 0018     20 LABEL : Cell Value, String Constant - SmuJw len=0 
' 0018     24 LABEL : Cell Value, String Constant - TsSAYnwBD len=0 
' 0018     25 LABEL : Cell Value, String Constant - uRGhuhPnLF len=0 
' 0018     25 LABEL : Cell Value, String Constant - vFeoInRlxx len=0 
' 0018     22 LABEL : Cell Value, String Constant - vykGdBa len=0 
' 0018     20 LABEL : Cell Value, String Constant - WqyJo 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
... (truncated)

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