Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5babfbe49ea18589…

MALICIOUS

Office (OLE)

118.0 KB Created: 2009-08-24 21:49:59 Authoring application: Microsoft Excel First seen: 2020-09-15
MD5: 6237590b08d1b9bf65763b59d6cbaa2f SHA-1: f43da2fb67b456b97e1fd95cc6a39bfc9abed9fe SHA-256: 5babfbe49ea18589ff2649407c0de8aeb2da059b819a0c1be5404ca84dde2e51
200 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled document containing an Auto_Open macro, which is a known technique for executing malicious code upon opening. The document body displays a social engineering lure to enable editing and content, aiming to bypass security warnings and execute the embedded XLM macros. ClamAV also identified this file as a known dropper.

Heuristics 4

  • ClamAV: Xls.Dropper.Agent-8803532-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8803532-0
  • 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) 60180 bytes
SHA-256: d439f6142a9b4a3c2085a69107f616ab2013d9d3ccb2b914205cac490b4d8ae4
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 -  sDHhjHMczXU43qOBI
' 0018     20 LABEL : Cell Value, String Constant - acGvu len=0 
' 0018     18 LABEL : Cell Value, String Constant - asr len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open hidden len=7 ptgRef3d  Sheet!CE62567 
' 0018     20 LABEL : Cell Value, String Constant - bfPgf len=0 
' 0018     21 LABEL : Cell Value, String Constant - BMhzuG len=0 
' 0018     19 LABEL : Cell Value, String Constant - BTyP len=0 
' 0018     18 LABEL : Cell Value, String Constant - chx len=0 
' 0018     18 LABEL : Cell Value, String Constant - ctj len=0 
' 0018     21 LABEL : Cell Value, String Constant - DDoucl len=0 
' 0018     21 LABEL : Cell Value, String Constant - dglWdy len=0 
' 0018     19 LABEL : Cell Value, String Constant - Dmsq len=0 
' 0018     19 LABEL : Cell Value, String Constant - DQEc len=0 
' 0018     19 LABEL : Cell Value, String Constant - dzKg len=0 
' 0018     32 LABEL : Cell Value, String Constant -        hidden len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00N\xfdy\xfd\xf8\x00\xf8\x00'
' 0018     21 LABEL : Cell Value, String Constant - ETfFng len=0 
' 0018     18 LABEL : Cell Value, String Constant - fej len=0 
' 0018     18 LABEL : Cell Value, String Constant - ftV len=0 
' 0018     21 LABEL : Cell Value, String Constant - fUNxnA len=0 
' 0018     19 LABEL : Cell Value, String Constant - fvqB len=0 
' 0018     20 LABEL : Cell Value, String Constant - gBtVt len=0 
' 0018     21 LABEL : Cell Value, String Constant - gGfzfZ len=0 
' 0018     19 LABEL : Cell Value, String Constant - gHEY len=0 
' 0018     19 LABEL : Cell Value, String Constant - gKwZ len=0 
' 0018     19 LABEL : Cell Value, String Constant - GliF len=0 
' 0018     20 LABEL : Cell Value, String Constant - GQmpA len=0 
' 0018     19 LABEL : Cell Value, String Constant - hmft len=0 
' 0018     21 LABEL : Cell Value, String Constant - HVkrjR len=0 
' 0018     21 LABEL : Cell Value, String Constant - HwnvOn len=0 
' 0018     20 LABEL : Cell Value, String Constant - HxFjv len=0 
' 0018     19 LABEL : Cell Value, String Constant - iHMe len=0 
' 0018     21 LABEL : Cell Value, String Constant - ItESVM len=0 
' 0018     21 LABEL : Cell Value, String Constant - iWIJAl len=0 
' 0018     19 LABEL : Cell Value, String Constant - iYCU len=0 
' 0018     18 LABEL : Cell Value, String Constant - jfv len=0 
' 0018     21 LABEL : Cell Value, String Constant - JKUfES len=0 
' 0018     20 LABEL : Cell Value, String Constant - jlQZS len=0 
' 0018     20 LABEL : Cell Value, String Constant - kQGgF len=0 
' 0018     20 LABEL : Cell Value, String Constant - lottZ len=0 
' 0018     18 LABEL : Cell Value, String Constant - Mat len=0 
' 0018     19 LABEL : Cell Value, String Constant - MnGu len=0 
' 0018     20 LABEL : Cell Value, String Constant - mPhHC len=0 
' 0018     18 LABEL : Cell Value, String Constant - MvF len=0 
' 0018     18 LABEL : Cell Value, String Constant - MYk len=0 
' 0018     19 LABEL : Cell Value, String Constant - nCpa len=0 
' 0018     20 LABEL : Cell Value, String Constant - nNaNS len=0 
' 0018     18 LABEL : Cell Value, String Constant - oEF len=0 
' 0018     19 LABEL : Cell Value, String Constant - olrW len=0 
' 0018     21 LABEL : Cell Value, String Constant - Pkpndm len=0 
' 0018     21 LABEL : Cell Value, String Constant - PLhUhA len=0 
' 0018     18 LABEL : Cell Value, String Constant - PMB len=0 
' 0018     20 LABEL : Cell Value, String Constant - QaRcO len=0 
' 0018     31 LABEL : Cell Value, String Constant -       hidden len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00\xf4\xa4\x13\xa5/\x00/\x00'
' 0018     21 LABEL : Cell Value, String Constant - QvMyos len=0 
' 0018     20 LABEL : Cell Value, String Constant - RBVOn len=0 
' 0018     21 LABEL : Cell Value, String Constant - RhAHUs len=0 
' 0018     19 LABEL : Cell Value, String Constant - rngO len=0 
' 
... (truncated)

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