Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 353dde11aaf3de0a…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:25:38 Authoring application: Microsoft Excel First seen: 2021-09-17
MD5: a7c55ef0ceddf16fdfd8ec5696631204 SHA-1: c5d22e0b1510cda9704fe425753ef9673cdd3128 SHA-256: 353dde11aaf3de0a276a7b5895ffc126995e55176cfd532fbea10f05c8646500
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 function, which is a known technique for executing malicious code. The presence of dangerous formula APIs like RUN indicates an intent to run external commands or payloads. The macro sheet itself is heavily obfuscated, suggesting an attempt to hide its malicious functionality.

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) 6657 bytes
SHA-256: d93c8084e66f222382b2eb21cab1e852e29955577d55bf3c08fe2ac787d061f9
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  lmWUxsJrd
' 0018     22 LABEL : Cell Value, String Constant - AacfjWV len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F169 
' 0018     23 LABEL : Cell Value, String Constant - bBrSYTTw len=0 
' 0018     25 LABEL : Cell Value, String Constant - bdpxuMOUiv len=0 
' 0018     25 LABEL : Cell Value, String Constant - BpUjyuIOVT len=0 
' 0018     24 LABEL : Cell Value, String Constant - dQTmfdJFz len=0 
' 0018     21 LABEL : Cell Value, String Constant - EObTMs len=0 
' 0018     24 LABEL : Cell Value, String Constant - fZbiNDqeV len=0 
' 0018     25 LABEL : Cell Value, String Constant - GRYHZYPuyw len=0 
' 0018     20 LABEL : Cell Value, String Constant - hZHWU len=0 
' 0018     26 LABEL : Cell Value, String Constant - KZdQhFyrdMz len=0 
' 0018     26 LABEL : Cell Value, String Constant - nMDIXLNwvtm len=0 
' 0018     20 LABEL : Cell Value, String Constant - OEnuw len=0 
' 0018     27 LABEL : Cell Value, String Constant - oNgCcgRyFDbz len=0 
' 0018     26 LABEL : Cell Value, String Constant - paABDFxosCw len=0 
' 0018     23 LABEL : Cell Value, String Constant - PHzwbCph len=0 
' 0018     23 LABEL : Cell Value, String Constant - ScJTehHT len=0 
' 0018     25 LABEL : Cell Value, String Constant - SJsTOuVNol len=0 
' 0018     22 LABEL : Cell Value, String Constant - wfcaLfP len=0 
' 0018     24 LABEL : Cell Value, String Constant - xfVsvYbra len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZgdGdmwjp 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
' 
... (truncated)

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