Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6228f7fd750ce1a9…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:41:32 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: b7961d3ec9f9fcca88874fc754d4a38e SHA-1: 7f978d996a7c631ab7fb6d6cf4fbc59925ae6acd SHA-256: 6228f7fd750ce1a9cc69a153b219ee2f78aaf39e4d7bdf702927eb84a04fb4eb
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 and dangerous formula APIs, specifically the RUN function. This strongly suggests the macro is designed to execute arbitrary code upon opening the document. While no specific URLs or further payloads were extracted, the presence of the Auto_Open function is a high-priority indicator for malicious execution.

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) 6492 bytes
SHA-256: dfcf067cf823814ab2e3ee6869ad3ac542322f760db33ee1a37b4ef12bd44cc6
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  ifDaWAC
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C152 
' 0018     26 LABEL : Cell Value, String Constant - bHbvpaBQMaJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - DQYMinaleWAQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - gMZhgBakkdD len=0 
' 0018     26 LABEL : Cell Value, String Constant - HlOfSOZtqZe len=0 
' 0018     26 LABEL : Cell Value, String Constant - HxEVwQpurGE len=0 
' 0018     25 LABEL : Cell Value, String Constant - JLkkxveecx len=0 
' 0018     22 LABEL : Cell Value, String Constant - MbAJODq len=0 
' 0018     21 LABEL : Cell Value, String Constant - mTtiQs len=0 
' 0018     27 LABEL : Cell Value, String Constant - nlyDjdVKaCjC len=0 
' 0018     20 LABEL : Cell Value, String Constant - nqRHv len=0 
' 0018     20 LABEL : Cell Value, String Constant - nrnbe len=0 
' 0018     25 LABEL : Cell Value, String Constant - okwvZMCxtC len=0 
' 0018     25 LABEL : Cell Value, String Constant - PeJtjKGkEx len=0 
' 0018     23 LABEL : Cell Value, String Constant - REGUtpOz len=0 
' 0018     22 LABEL : Cell Value, String Constant - rLigaHe len=0 
' 0018     21 LABEL : Cell Value, String Constant - vNJKSW len=0 
' 0018     20 LABEL : Cell Value, String Constant - VybbG len=0 
' 0018     23 LABEL : Cell Value, String Constant - VZfJsLPv len=0 
' 0018     22 LABEL : Cell Value, String Constant - vzmEkvW len=0 
' 0018     20 LABEL : Cell Value, String Constant - zZkHZ 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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