Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7f9c5ce87cc02f3a…

MALICIOUS

Office (OLE)

37.0 KB Created: 2020-11-27 11:45:47 Authoring application: Microsoft Excel First seen: 2021-10-11
MD5: 6ba7c724322c474b820cc0d99e5786ef SHA-1: d4c75eac9225a837843b544f65dc555a8a25691b SHA-256: 7f9c5ce87cc02f3ae135db975c45e95cd70e88451af20e5850c48f47969fc85a
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 indicator of malicious intent. This technique allows for the execution of arbitrary commands upon opening the workbook, bypassing standard macro security. The presence of dangerous formula APIs further increases the risk, suggesting the macro is designed to run 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) 6831 bytes
SHA-256: adb97d47061f3fbf064fa0d63d87a4ba53867ebf0de4e137718e55aaa6e3186e
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  DALLQY
' 0018     27 LABEL : Cell Value, String Constant - AFdfWBZVQpkq len=0 
' 0018     24 LABEL : Cell Value, String Constant - AlfPUxJXY len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F192 
' 0018     25 LABEL : Cell Value, String Constant - bTdAtEzPsE len=0 
' 0018     24 LABEL : Cell Value, String Constant - cucdGLRxf len=0 
' 0018     26 LABEL : Cell Value, String Constant - dkABsgVuTez len=0 
' 0018     23 LABEL : Cell Value, String Constant - dygbeTxn len=0 
' 0018     25 LABEL : Cell Value, String Constant - eiZnrPYHZD len=0 
' 0018     24 LABEL : Cell Value, String Constant - IpAEipFDc len=0 
' 0018     22 LABEL : Cell Value, String Constant - Jomnsmn len=0 
' 0018     26 LABEL : Cell Value, String Constant - JsPveeqxmMv len=0 
' 0018     25 LABEL : Cell Value, String Constant - kvddalcHIn len=0 
' 0018     27 LABEL : Cell Value, String Constant - MiLYVlRGKldA len=0 
' 0018     23 LABEL : Cell Value, String Constant - pIlQBIJM len=0 
' 0018     22 LABEL : Cell Value, String Constant - tbtlUIz len=0 
' 0018     25 LABEL : Cell Value, String Constant - uIgcygQTkw len=0 
' 0018     25 LABEL : Cell Value, String Constant - wjdUIwlGNb len=0 
' 0018     27 LABEL : Cell Value, String Constant - wRfSRjvRzXAy len=0 
' 0018     20 LABEL : Cell Value, String Constant - xkgup len=0 
' 0018     21 LABEL : Cell Value, String Constant - YOruwL len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZHSnBF 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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