Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e7e1f05f8daf1b4c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:02 Authoring application: Microsoft Excel First seen: 2021-09-23
MD5: 5ebc7c023202973af05f3c83eeba0dec SHA-1: e4107c40ad7f264fc5ce8525d2b0009940e52cb5 SHA-256: e7e1f05f8daf1b4cd5295816bf34cc844d1b0309e018baa1897db478bbe213d2
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 indicating potential malicious execution. The presence of dangerous formula APIs further supports this. While no specific URLs or payloads were extracted, the Auto_Open macro is designed to run code automatically upon opening the document, likely leading to further stages of infection.

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) 6697 bytes
SHA-256: e471d2ab1c0fc7b4059a17091f0f9a89877473e6538c69a1f1db1ee07cedd50c
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 -  yJsb
' 0018     24 LABEL : Cell Value, String Constant - ApkUYUgXQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B187 
' 0018     26 LABEL : Cell Value, String Constant - azfSoUSxBUi len=0 
' 0018     27 LABEL : Cell Value, String Constant - CekLFmobaNvQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - ceYrV len=0 
' 0018     26 LABEL : Cell Value, String Constant - DRPsPqrizrU len=0 
' 0018     23 LABEL : Cell Value, String Constant - euXPPyzj len=0 
' 0018     22 LABEL : Cell Value, String Constant - JBHkBUv len=0 
' 0018     21 LABEL : Cell Value, String Constant - LirHtl len=0 
' 0018     27 LABEL : Cell Value, String Constant - MffwDuisduMD len=0 
' 0018     25 LABEL : Cell Value, String Constant - ogrFaKpGxo len=0 
' 0018     26 LABEL : Cell Value, String Constant - QlnwLhMBdBK len=0 
' 0018     21 LABEL : Cell Value, String Constant - rCDlhh len=0 
' 0018     23 LABEL : Cell Value, String Constant - RhkRdGKq len=0 
' 0018     27 LABEL : Cell Value, String Constant - rMIwVzUKbHTm len=0 
' 0018     23 LABEL : Cell Value, String Constant - RpduNLSP len=0 
' 0018     26 LABEL : Cell Value, String Constant - TlBaDTVfdGV len=0 
' 0018     25 LABEL : Cell Value, String Constant - UkJWOuxepA len=0 
' 0018     20 LABEL : Cell Value, String Constant - UuJvg len=0 
' 0018     26 LABEL : Cell Value, String Constant - wMhqEcWmpxF len=0 
' 0018     25 LABEL : Cell Value, String Constant - YVqDxjeVua 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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