Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 694d1009da9f49fe…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:15 Authoring application: Microsoft Excel First seen: 2021-09-15
MD5: 1cac4ff1014ab5b9ac38a934cef31ef7 SHA-1: 66caf224422bba216ef7293d363aa8fa398a7b08 SHA-256: 694d1009da9f49fee394fd5a413c85325ea797a25b2924e71afa57d92d33b6fe
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. This indicates the file is designed to automatically execute malicious code upon opening. The presence of dangerous formula APIs like RUN further confirms its malicious intent to execute arbitrary commands.

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) 6443 bytes
SHA-256: 306495e28d0c94f233cc3211e2fcc16187f8e62c50df2a3a1c5f45e8b64553b5
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  VXVQ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I156 
' 0018     23 LABEL : Cell Value, String Constant - AVQeZeHS len=0 
' 0018     25 LABEL : Cell Value, String Constant - bHMFrOJwde len=0 
' 0018     23 LABEL : Cell Value, String Constant - FsEIAqMn len=0 
' 0018     25 LABEL : Cell Value, String Constant - gByyVwrTRN len=0 
' 0018     25 LABEL : Cell Value, String Constant - kVnsUSiwJT len=0 
' 0018     24 LABEL : Cell Value, String Constant - nwPKazdtk len=0 
' 0018     27 LABEL : Cell Value, String Constant - pnjDvUmyBsmH len=0 
' 0018     27 LABEL : Cell Value, String Constant - qJBtdbctSsRB len=0 
' 0018     25 LABEL : Cell Value, String Constant - QUTvUtamWA len=0 
' 0018     23 LABEL : Cell Value, String Constant - RphGpuQA len=0 
' 0018     24 LABEL : Cell Value, String Constant - sKblGpqFS len=0 
' 0018     24 LABEL : Cell Value, String Constant - tIbMDzbhY len=0 
' 0018     23 LABEL : Cell Value, String Constant - TzbkbXfD len=0 
' 0018     24 LABEL : Cell Value, String Constant - uLejCEEAB len=0 
' 0018     27 LABEL : Cell Value, String Constant - uuNmSUyvQapf len=0 
' 0018     24 LABEL : Cell Value, String Constant - UyXoDQMFd len=0 
' 0018     20 LABEL : Cell Value, String Constant - vKVTh len=0 
' 0018     27 LABEL : Cell Value, String Constant - XHxcOiWqflNh len=0 
' 0018     22 LABEL : Cell Value, String Constant - xMysfrP len=0 
' 0018     22 LABEL : Cell Value, String Constant - xUFYYmO 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/ SS
... (truncated)

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