Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 644ceed05a569d6d…

MALICIOUS

Office (OLE)

110.5 KB Created: 2015-08-04 03:11:00 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 3a8d8149fcc17167317b55609ff4d002 SHA-1: 5a759aa24cd49648b921d449d639f8d65f2ad8da SHA-256: 644ceed05a569d6def277482524ba8c2e8926838d1fdb9062a3c2f49a5c5a7af
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 containing an Auto_Open macro, which is a critical finding. The document body displays a "DOCUMENT PROTECTED!" lure, instructing the user to "Enable Editing" and "Enable Content" to bypass security warnings. This strongly suggests a social engineering attack to execute the embedded XLM macro, which is designed to perform malicious actions.

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) 56745 bytes
SHA-256: e1207793df20cdf84edb3f74504b3fd10fd89f190ddb7e8e5f03120b0fa29fd2
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 -  UZVA22MrPm5U6v3lN
' 0018     20 LABEL : Cell Value, String Constant - AGjKB len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open hidden len=7 ptgRef3d  Sheet!CU52344 
' 0018     18 LABEL : Cell Value, String Constant - aVL len=0 
' 0018     21 LABEL : Cell Value, String Constant - AxYahM len=0 
' 0018     19 LABEL : Cell Value, String Constant - AZdh len=0 
' 0018     21 LABEL : Cell Value, String Constant - baUSvq len=0 
' 0018     18 LABEL : Cell Value, String Constant - bCc len=0 
' 0018     18 LABEL : Cell Value, String Constant - BGg len=0 
' 0018     18 LABEL : Cell Value, String Constant - Blg len=0 
' 0018     21 LABEL : Cell Value, String Constant - bRsBmH len=0 
' 0018     34 LABEL : Cell Value, String Constant -          hidden len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00\xe5z\x10{\\\x00\\\x00'
' 0018     20 LABEL : Cell Value, String Constant - CGLae len=0 
' 0018     18 LABEL : Cell Value, String Constant - cSc len=0 
' 0018     21 LABEL : Cell Value, String Constant - dEXsxq len=0 
' 0018     18 LABEL : Cell Value, String Constant - dpo len=0 
' 0018     33 LABEL : Cell Value, String Constant -         hidden len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00\x18\xf28\xf2\xcd\x00\xcd\x00'
' 0018     20 LABEL : Cell Value, String Constant - DxQfU len=0 
' 0018     20 LABEL : Cell Value, String Constant - EcWGr len=0 
' 0018     19 LABEL : Cell Value, String Constant - ejQh len=0 
' 0018     20 LABEL : Cell Value, String Constant - FNqpe len=0 
' 0018     21 LABEL : Cell Value, String Constant - Fqtmbn len=0 
' 0018     21 LABEL : Cell Value, String Constant - fxdloA len=0 
' 0018     21 LABEL : Cell Value, String Constant - GbTkZg len=0 
' 0018     19 LABEL : Cell Value, String Constant - gJJF len=0 
' 0018     20 LABEL : Cell Value, String Constant - GRXKj len=0 
' 0018     20 LABEL : Cell Value, String Constant - Gwdwc len=0 
' 0018     20 LABEL : Cell Value, String Constant - GWhnI len=0 
' 0018     19 LABEL : Cell Value, String Constant - HGOu len=0 
' 0018     18 LABEL : Cell Value, String Constant - hhP len=0 
' 0018     21 LABEL : Cell Value, String Constant - hIdItG len=0 
' 0018     19 LABEL : Cell Value, String Constant - hNZm len=0 
' 0018     21 LABEL : Cell Value, String Constant - HpYKzc len=0 
' 0018     20 LABEL : Cell Value, String Constant - IdcOs len=0 
' 0018     18 LABEL : Cell Value, String Constant - iPg len=0 
' 0018     21 LABEL : Cell Value, String Constant - iSYwZI len=0 
' 0018     19 LABEL : Cell Value, String Constant - iYel len=0 
' 0018     18 LABEL : Cell Value, String Constant - Jrs len=0 
' 0018     18 LABEL : Cell Value, String Constant - Juh len=0 
' 0018     21 LABEL : Cell Value, String Constant - kzWYdQ len=0 
' 0018     18 LABEL : Cell Value, String Constant - lET len=0 
' 0018     18 LABEL : Cell Value, String Constant - lJD len=0 
' 0018     36 LABEL : Cell Value, String Constant -            hidden len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00\xa4\xb1\xf4\xb1t\x00t\x00'
' 0018     19 LABEL : Cell Value, String Constant - LWiS len=0 
' 0018     19 LABEL : Cell Value, String Constant - MHjF len=0 
' 0018     18 LABEL : Cell Value, String Constant - MMi len=0 
' 0018     19 LABEL : Cell Value, String Constant - MQKl len=0 
' 0018     20 LABEL : Cell Value, String Constant - MuqbA len=0 
' 0018     20 LABEL : Cell Value, String Constant - NtRKh len=0 
' 0018     18 LABEL : Cell Value, String Constant - nze len=0 
' 0018     21 LABEL : Cell Value, String Constant - OkPPaE len=0 
' 0018     21 LABEL : Cell Value, String Constant - oNvzBD len=0 
' 0018     20 LABEL : Cell Value, String Constant - padGF len=0 
' 0018     20 LABEL : Cell Value, String Constant - POciB len=0 
' 0018     20 LABEL : Cell Value, String Constant - qACfX len=0 
' 0018   
... (truncated)

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