Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2265f60a8e42ce57…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:40:21 Authoring application: Microsoft Excel First seen: 2021-09-17
MD5: 1fb5de7c7c6696930ceed8799209b9a7 SHA-1: ad2275b4ed22187335e3b4e1f2da70e420a6a237 SHA-256: 2265f60a8e42ce5749d9b1b4991de718d2933724948973d2f8f7ff72cb6c5da7
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 defined name, which is a common technique for executing malicious code upon opening the document. The macro sheet contains dangerous formula APIs, specifically a RUN function, suggesting it is designed to execute an external payload. No specific family could be identified, and no direct IOCs like URLs or hashes were extracted from the macro content itself.

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) 6844 bytes
SHA-256: f90c09bcbf7a0ab18673a76c427f50243570c998ac88129f92a72a92310a6e34
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  NiGAUtrItSR
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A147 
' 0018     20 LABEL : Cell Value, String Constant - EtUiD len=0 
' 0018     26 LABEL : Cell Value, String Constant - gLkaLIVWklU len=0 
' 0018     20 LABEL : Cell Value, String Constant - IApQK len=0 
' 0018     27 LABEL : Cell Value, String Constant - jdaUEvZshDWe len=0 
' 0018     21 LABEL : Cell Value, String Constant - MNsvyx len=0 
' 0018     22 LABEL : Cell Value, String Constant - MXtnNEU len=0 
' 0018     22 LABEL : Cell Value, String Constant - oIBNNjH len=0 
' 0018     23 LABEL : Cell Value, String Constant - owbPOGrI len=0 
' 0018     20 LABEL : Cell Value, String Constant - pPGRu len=0 
' 0018     21 LABEL : Cell Value, String Constant - SHxPJv len=0 
' 0018     26 LABEL : Cell Value, String Constant - tFGRYEcgcIf len=0 
' 0018     20 LABEL : Cell Value, String Constant - TkDgW len=0 
' 0018     22 LABEL : Cell Value, String Constant - VAWqygO len=0 
' 0018     25 LABEL : Cell Value, String Constant - WrGXpnbvmK len=0 
' 0018     22 LABEL : Cell Value, String Constant - xLHMnMM len=0 
' 0018     26 LABEL : Cell Value, String Constant - xYshlzGrzfT len=0 
' 0018     24 LABEL : Cell Value, String Constant - YdFTBvJLS len=0 
' 0018     25 LABEL : Cell Value, String Constant - YZtqPtBYGa len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZcqpQHCLX len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZHLnhnDuT 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 L
... (truncated)

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