Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d6c8bdc697e9665d…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:43:42 Authoring application: Microsoft Excel First seen: 2021-07-10
MD5: c1ccee9efd9aa3f101a92831bdbdb41e SHA-1: 2ab8af7641db8709c221a140ea36b433c33d70ce SHA-256: d6c8bdc697e9665df16e8c426ad1345adad79a363565251f91c3f7f70f3ff101
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro sheet containing an Auto_Open entry, which is a common technique for executing malicious code upon opening. The presence of dangerous formula APIs in the Auto_Open macro indicates an intent to run arbitrary commands or exploit vulnerabilities. No specific family could be identified, and no direct IOCs like URLs or hashes were extracted from the macro content.

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) 6872 bytes
SHA-256: 0ee027f26d67ed4cb4b4375d556497559a5acbf6a22550ae98bbe7074cb08afd
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  xOWiNFAjWaN
' 0018     22 LABEL : Cell Value, String Constant - ABiPXSx len=0 
' 0018     23 LABEL : Cell Value, String Constant - aOBjCRid len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B132 
' 0018     27 LABEL : Cell Value, String Constant - EUGwYPemtGel len=0 
' 0018     22 LABEL : Cell Value, String Constant - fkDirlX len=0 
' 0018     25 LABEL : Cell Value, String Constant - GTkcsvhQYM len=0 
' 0018     22 LABEL : Cell Value, String Constant - kyZjfsO len=0 
' 0018     27 LABEL : Cell Value, String Constant - LCBqAkLOtbBC len=0 
' 0018     27 LABEL : Cell Value, String Constant - lICgTUbhyBxv len=0 
' 0018     25 LABEL : Cell Value, String Constant - MsCXuYJZfI len=0 
' 0018     20 LABEL : Cell Value, String Constant - NjhKs len=0 
' 0018     23 LABEL : Cell Value, String Constant - QvOWOpQY len=0 
' 0018     27 LABEL : Cell Value, String Constant - qXhRzFEIaEZL len=0 
' 0018     26 LABEL : Cell Value, String Constant - rFNldWJkEKf len=0 
' 0018     27 LABEL : Cell Value, String Constant - ShEAwRhBfUdi len=0 
' 0018     20 LABEL : Cell Value, String Constant - tQcKf len=0 
' 0018     20 LABEL : Cell Value, String Constant - uAziY len=0 
' 0018     22 LABEL : Cell Value, String Constant - UPYPjfb len=0 
' 0018     27 LABEL : Cell Value, String Constant - VQnLUJNXYjvP len=0 
' 0018     25 LABEL : Cell Value, String Constant - WGOERVirqb len=0 
' 0018     22 LABEL : Cell Value, String Constant - YXwiLnQ 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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