Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 be5dd514e0ae2e6b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:29 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 3a2d346e4bd4e7e4fcf8880e292968e8 SHA-1: bb5ec134f3485aaaf75a98ba7e725cc06acf0132 SHA-256: be5dd514e0ae2e6bb00ccc7b807ed0943bc21fe3267e8934c7c0bc4d30593521
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

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 further suggests malicious intent. This points to a macro-based attack, likely delivered as a spearphishing attachment, designed to execute arbitrary code.

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) 6817 bytes
SHA-256: 34523a579011c1dc3e96be1c0e409e3962950d9721bd6e1becdedc4dbbbf8f74
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 -  dHIyGreFzc
' 0018     22 LABEL : Cell Value, String Constant - aCObAaM len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C183 
' 0018     20 LABEL : Cell Value, String Constant - CTXNQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - CyGandvqZJZE len=0 
' 0018     21 LABEL : Cell Value, String Constant - dgvFfP len=0 
' 0018     25 LABEL : Cell Value, String Constant - IhirdRPyes len=0 
' 0018     24 LABEL : Cell Value, String Constant - iszelNDFI len=0 
' 0018     23 LABEL : Cell Value, String Constant - KBcOJldn len=0 
' 0018     20 LABEL : Cell Value, String Constant - LUCnc len=0 
' 0018     23 LABEL : Cell Value, String Constant - MmKnzWFF len=0 
' 0018     26 LABEL : Cell Value, String Constant - MpeHzgZphdJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - Mulznbpxbf len=0 
' 0018     20 LABEL : Cell Value, String Constant - NPoFd len=0 
' 0018     22 LABEL : Cell Value, String Constant - pkJaUqo len=0 
' 0018     23 LABEL : Cell Value, String Constant - QBbloNCX len=0 
' 0018     22 LABEL : Cell Value, String Constant - QuHQPSo len=0 
' 0018     26 LABEL : Cell Value, String Constant - SaPCQaqFahG len=0 
' 0018     22 LABEL : Cell Value, String Constant - tFrivIl len=0 
' 0018     25 LABEL : Cell Value, String Constant - UYkMNxATnG len=0 
' 0018     27 LABEL : Cell Value, String Constant - vkOgyeexyEbq len=0 
' 0018     21 LABEL : Cell Value, String Constant - WaVZwJ 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     1
... (truncated)

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