Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 683c60ffe239748b…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:43:32 Authoring application: Microsoft Excel First seen: 2021-10-02
MD5: 626d8018736db0e6f11c17fb1111219c SHA-1: d55e2bd22e9855d51c2d50ce9ce5e2b8c2636fd1 SHA-256: 683c60ffe239748be8504494e4655afe25e50bf8a99e7cf67cd11aa31a8dfe46
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel spreadsheet containing Excel 4.0 macros, specifically an Auto_Open function, which is a known method for executing malicious code upon opening. The presence of dangerous formula APIs like RUN further indicates malicious intent. Without further deobfuscation or network activity, the exact payload and family remain unknown.

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) 6922 bytes
SHA-256: fc85b0b8ae1a70f1c00a85318dae9d46f69393f45445a82bc5c8eaa64f7cd6be
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 -  MnnnGQlbgd
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F178 
' 0018     27 LABEL : Cell Value, String Constant - bPDsWzuJfngA len=0 
' 0018     21 LABEL : Cell Value, String Constant - bvpHqh len=0 
' 0018     27 LABEL : Cell Value, String Constant - fHHjZfSKNodM len=0 
' 0018     21 LABEL : Cell Value, String Constant - FKZfgd len=0 
' 0018     27 LABEL : Cell Value, String Constant - hwstIirqNnXb len=0 
' 0018     24 LABEL : Cell Value, String Constant - iPBokfUES len=0 
' 0018     20 LABEL : Cell Value, String Constant - IwNaE len=0 
' 0018     20 LABEL : Cell Value, String Constant - MeoSi len=0 
' 0018     20 LABEL : Cell Value, String Constant - mUQmc len=0 
' 0018     21 LABEL : Cell Value, String Constant - niLaGX len=0 
' 0018     20 LABEL : Cell Value, String Constant - POtfC len=0 
' 0018     25 LABEL : Cell Value, String Constant - QTHTTrgjwq len=0 
' 0018     20 LABEL : Cell Value, String Constant - sjImd len=0 
' 0018     22 LABEL : Cell Value, String Constant - TBGXUkx len=0 
' 0018     24 LABEL : Cell Value, String Constant - TqGCfipQK len=0 
' 0018     21 LABEL : Cell Value, String Constant - UvTsmD len=0 
' 0018     26 LABEL : Cell Value, String Constant - vfOtkaoXebz len=0 
' 0018     27 LABEL : Cell Value, String Constant - xweKSfcYStzX len=0 
' 0018     24 LABEL : Cell Value, String Constant - ylCCZXteU len=0 
' 0018     27 LABEL : Cell Value, String Constant - YNDHYBizbFHY 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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