Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a1995d496e2daf84…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:45:48 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 55189282c5a2e605d589cc234a7c6258 SHA-1: dd6d6a6d96fc4df0894017ed6fe7c1361436290d SHA-256: a1995d496e2daf84a495cccccdb3261f8f5797dd19c46f356a7e985dea4f8d72
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 defined name, which is a common technique for executing malicious code upon opening the workbook. The use of dangerous formula APIs like RUN further supports this. No specific IOCs like URLs or file paths were extracted, but the mechanism of execution is clear.

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) 6527 bytes
SHA-256: 3ad081099cb11d63410896e1e6bcc12147777922d7a38c2d7cdc46693c0909bf
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  PGbRaLUh
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F139 
' 0018     27 LABEL : Cell Value, String Constant - bbkdgIwgvEVU len=0 
' 0018     27 LABEL : Cell Value, String Constant - BpQKCsztohyO len=0 
' 0018     21 LABEL : Cell Value, String Constant - cFImUp len=0 
' 0018     21 LABEL : Cell Value, String Constant - cfjoML len=0 
' 0018     24 LABEL : Cell Value, String Constant - CVtBudVvy len=0 
' 0018     20 LABEL : Cell Value, String Constant - dAmHP len=0 
' 0018     25 LABEL : Cell Value, String Constant - dQcEFjorvL len=0 
' 0018     21 LABEL : Cell Value, String Constant - iDgXaj len=0 
' 0018     26 LABEL : Cell Value, String Constant - jVHXVJArNhp len=0 
' 0018     26 LABEL : Cell Value, String Constant - JwzENKsFLCM len=0 
' 0018     26 LABEL : Cell Value, String Constant - kVTliUVUWyN len=0 
' 0018     22 LABEL : Cell Value, String Constant - qEALdYp len=0 
' 0018     21 LABEL : Cell Value, String Constant - qVxejF len=0 
' 0018     21 LABEL : Cell Value, String Constant - raEeWW len=0 
' 0018     20 LABEL : Cell Value, String Constant - rYQkc len=0 
' 0018     21 LABEL : Cell Value, String Constant - sIFMcA len=0 
' 0018     27 LABEL : Cell Value, String Constant - UWXNfisotsIg len=0 
' 0018     24 LABEL : Cell Value, String Constant - VZzTnEMBj len=0 
' 0018     21 LABEL : Cell Value, String Constant - wBsqoO len=0 
' 0018     26 LABEL : Cell Value, String Constant - zgWzOKXGTtQ 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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