Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e778ee0ac5513119…

MALICIOUS

Office (OLE)

134.0 KB Created: 2010-06-27 02:51:00 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 32be081e75cc5beb0ffbf7189325444e SHA-1: 29b0d71295e2ecb57a89e885bdda79238c0d8e08 SHA-256: e778ee0ac55131192b71a180e55df087b4523143dd0eb80c8df95d98b80f3715
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is an Excel 4.0 macro-enabled document. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code upon opening. The document body displays a fake warning to encourage users to enable content, which would trigger the macro execution. No specific family could be identified, but the technique suggests a macro-based downloader or initial access vector.

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) 77136 bytes
SHA-256: fb636ec6fced4feccf5090a9aa09e095746b91ccf88263dbe6a0362f973b4582
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     26 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  BgGIL5lfRvUbzqcAW
' 0018     35 LABEL : Cell Value, String Constant -           hidden len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00=\xe6\xaf\xe6\xe9\x00\xe9\x00'
' 0018     20 LABEL : Cell Value, String Constant - aHtcy len=0 
' 0018     18 LABEL : Cell Value, String Constant - ArM len=0 
' 0018     21 LABEL : Cell Value, String Constant - ATtial len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open hidden len=7 ptgRef3d  Sheet!DP4895 
' 0018     18 LABEL : Cell Value, String Constant - aYb len=0 
' 0018     20 LABEL : Cell Value, String Constant - bMgom len=0 
' 0018     18 LABEL : Cell Value, String Constant - bnd len=0 
' 0018     19 LABEL : Cell Value, String Constant - BsHC len=0 
' 0018     19 LABEL : Cell Value, String Constant - catP len=0 
' 0018     18 LABEL : Cell Value, String Constant - CCY len=0 
' 0018     21 LABEL : Cell Value, String Constant - cOxYHf len=0 
' 0018     18 LABEL : Cell Value, String Constant - cSo len=0 
' 0018     20 LABEL : Cell Value, String Constant - cwLze len=0 
' 0018     20 LABEL : Cell Value, String Constant - CyOvQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - dTHqwg len=0 
' 0018     18 LABEL : Cell Value, String Constant - dYp len=0 
' 0018     18 LABEL : Cell Value, String Constant - eBh len=0 
' 0018     19 LABEL : Cell Value, String Constant - ecma len=0 
' 0018     21 LABEL : Cell Value, String Constant - eEsOhj len=0 
' 0018     19 LABEL : Cell Value, String Constant - EFAO len=0 
' 0018     20 LABEL : Cell Value, String Constant - eHkLQ len=0 
' 0018     18 LABEL : Cell Value, String Constant - EJz len=0 
' 0018     21 LABEL : Cell Value, String Constant - erqrnw len=0 
' 0018     18 LABEL : Cell Value, String Constant - Etw len=0 
' 0018     20 LABEL : Cell Value, String Constant - FJlLw len=0 
' 0018     20 LABEL : Cell Value, String Constant - fnUmv len=0 
' 0018     20 LABEL : Cell Value, String Constant - FRvEz len=0 
' 0018     18 LABEL : Cell Value, String Constant - FvN len=0 
' 0018     18 LABEL : Cell Value, String Constant - FwF len=0 
' 0018     18 LABEL : Cell Value, String Constant - FwY len=0 
' 0018     18 LABEL : Cell Value, String Constant - FZO len=0 
' 0018     19 LABEL : Cell Value, String Constant - GBvS len=0 
' 0018     19 LABEL : Cell Value, String Constant - GJYl len=0 
' 0018     18 LABEL : Cell Value, String Constant - GSq len=0 
' 0018     18 LABEL : Cell Value, String Constant - Gto len=0 
' 0018     21 LABEL : Cell Value, String Constant - gUYtoz len=0 
' 0018     18 LABEL : Cell Value, String Constant - gza len=0 
' 0018     18 LABEL : Cell Value, String Constant - hEE len=0 
' 0018     20 LABEL : Cell Value, String Constant - hRBNI len=0 
' 0018     20 LABEL : Cell Value, String Constant - HUyij len=0 
' 0018     20 LABEL : Cell Value, String Constant - iBniB len=0 
' 0018     19 LABEL : Cell Value, String Constant - IdCU len=0 
' 0018     21 LABEL : Cell Value, String Constant - iKAdDU len=0 
' 0018     19 LABEL : Cell Value, String Constant - imLH len=0 
' 0018     21 LABEL : Cell Value, String Constant - IrZsmL len=0 
' 0018     19 LABEL : Cell Value, String Constant - itBS len=0 
' 0018     18 LABEL : Cell Value, String Constant - IWQ len=0 
' 0018     18 LABEL : Cell Value, String Constant - IwY len=0 
' 0018     21 LABEL : Cell Value, String Constant - jbbNFE len=0 
' 0018     19 LABEL : Cell Value, String Constant - jbbV len=0 
' 0018     19 LABEL : Cell Value, String Constant - JdLL len=0 
' 0018     21 LABEL : Cell Value, String Constant - jEihWH len=0 
' 0018     19 LABEL : Cell Value, String Constant - JGLN len=0 
' 0018     21 LABEL : Cell Value, String Constant - juuNgp len=0 
' 0018     20 LABEL : Cell Value, String Constant - jYOXT len=0 
' 0018     19 LABEL : Cell Value, String Constant - JZax len=0 
' 0018     21 LABEL : Cell Value, String Constant - jzYlaU len=0 
'
... (truncated)

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