Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 07f367efd26db58e…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:13 Authoring application: Microsoft Excel First seen: 2021-07-13
MD5: b4d07a98e6440164c0dbeb1bd1c7e0b3 SHA-1: 45a8529766adc655f40007cd949cf2419b68cdd2 SHA-256: 07f367efd26db58e140bafc80c93770a3efa311190ddf946e1b628c5b3685143
140 Risk Score

Malware Insights

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

This Excel file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a known technique for executing malicious code upon opening the workbook. The critical heuristic firings indicate the presence of dangerous formula APIs, suggesting the macro is designed to run arbitrary commands. No specific family could be identified, but the technique is common for initial 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) 6584 bytes
SHA-256: 69d14ff52a5e7188892e6860239a328b8f3accccc5348a30120357f335b294a8
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  UaIzejOE
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E134 
' 0018     25 LABEL : Cell Value, String Constant - AVeMPNyTET len=0 
' 0018     27 LABEL : Cell Value, String Constant - bgjEOgokfwUQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - CbcbtYSBq len=0 
' 0018     24 LABEL : Cell Value, String Constant - GirXBAHkw len=0 
' 0018     27 LABEL : Cell Value, String Constant - HflWZgTFCSiW len=0 
' 0018     25 LABEL : Cell Value, String Constant - hVtHrKHxqE len=0 
' 0018     24 LABEL : Cell Value, String Constant - IBrLapHVn len=0 
' 0018     20 LABEL : Cell Value, String Constant - iubWN len=0 
' 0018     26 LABEL : Cell Value, String Constant - jNjkdvlZxQD len=0 
' 0018     26 LABEL : Cell Value, String Constant - jWvcFxrNpze len=0 
' 0018     27 LABEL : Cell Value, String Constant - oElzaIFmhRyU len=0 
' 0018     22 LABEL : Cell Value, String Constant - rPBXUOf len=0 
' 0018     20 LABEL : Cell Value, String Constant - sjpkX len=0 
' 0018     26 LABEL : Cell Value, String Constant - sNQjBrbXwlJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - UiVtPuxvc len=0 
' 0018     20 LABEL : Cell Value, String Constant - VrXMM len=0 
' 0018     21 LABEL : Cell Value, String Constant - wSORqF len=0 
' 0018     26 LABEL : Cell Value, String Constant - WSQaPVQdhNW len=0 
' 0018     24 LABEL : Cell Value, String Constant - YCLQYuGZG len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZBVePgbuy 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/ 
... (truncated)

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