Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e5df93ae197a0bb7…

MALICIOUS

Office (OLE)

113.5 KB Created: 2016-05-20 04:30:00 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 76e02b4aa36044600799041e64875e3e SHA-1: 7af04ed3810088ef58cbc9dd53baff19b99bfd4a SHA-256: e5df93ae197a0bb7e324d72a5f9d23332a625d3e80479e7e7a64793c26a94700
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 known technique for executing malicious code upon opening. The document body displays a "DOCUMENT PROTECTED!" lure, instructing the user to "Enable Editing" and "Enable Content", typical of social engineering tactics to bypass security warnings. The presence of the Auto_Open macro and the document protection lure strongly suggest a malicious intent to execute arbitrary code.

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) 57159 bytes
SHA-256: 3fa9b543ba1638658336975994f17a8ffe2bfbb8d6aaa7195021cc3a687c90ff
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 -  YSZo0rCat0pgcBsoi
' 0018     20 LABEL : Cell Value, String Constant - AKLRq len=0 
' 0018     20 LABEL : Cell Value, String Constant - ALvHl len=0 
' 0018     18 LABEL : Cell Value, String Constant - APA len=0 
' 0018     21 LABEL : Cell Value, String Constant - arqbZv len=0 
' 0018     19 LABEL : Cell Value, String Constant - Atht len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open hidden len=7 ptgRef3d  Sheet!IP42288 
' 0018     21 LABEL : Cell Value, String Constant - BDkjoO len=0 
' 0018     20 LABEL : Cell Value, String Constant - BNjza len=0 
' 0018     21 LABEL : Cell Value, String Constant - brMVER len=0 
' 0018     20 LABEL : Cell Value, String Constant - BuBqn len=0 
' 0018     20 LABEL : Cell Value, String Constant - buOkx len=0 
' 0018     21 LABEL : Cell Value, String Constant - byUpvK len=0 
' 0018     18 LABEL : Cell Value, String Constant - CEO len=0 
' 0018     21 LABEL : Cell Value, String Constant - cucmas len=0 
' 0018     20 LABEL : Cell Value, String Constant - dFKsJ len=0 
' 0018     19 LABEL : Cell Value, String Constant - djFq len=0 
' 0018     20 LABEL : Cell Value, String Constant - DLFzD len=0 
' 0018     18 LABEL : Cell Value, String Constant - erT len=0 
' 0018     20 LABEL : Cell Value, String Constant - etJzN len=0 
' 0018     20 LABEL : Cell Value, String Constant - FJVeL len=0 
' 0018     18 LABEL : Cell Value, String Constant - gEF len=0 
' 0018     18 LABEL : Cell Value, String Constant - GQK len=0 
' 0018     19 LABEL : Cell Value, String Constant - hxrb len=0 
' 0018     20 LABEL : Cell Value, String Constant - IgaxM len=0 
' 0018     21 LABEL : Cell Value, String Constant - ijYfhv len=0 
' 0018     20 LABEL : Cell Value, String Constant - inRpd len=0 
' 0018     19 LABEL : Cell Value, String Constant - JDQV len=0 
' 0018     19 LABEL : Cell Value, String Constant - JPNk len=0 
' 0018     19 LABEL : Cell Value, String Constant - JSAY len=0 
' 0018     21 LABEL : Cell Value, String Constant - JuipTH len=0 
' 0018     18 LABEL : Cell Value, String Constant - kdI len=0 
' 0018     18 LABEL : Cell Value, String Constant - KLi len=0 
' 0018     21 LABEL : Cell Value, String Constant - kROKLr len=0 
' 0018     19 LABEL : Cell Value, String Constant - KwCb len=0 
' 0018     21 LABEL : Cell Value, String Constant - LfoxLg len=0 
' 0018     20 LABEL : Cell Value, String Constant - lhJbd len=0 
' 0018     20 LABEL : Cell Value, String Constant - lLqea len=0 
' 0018     18 LABEL : Cell Value, String Constant - Lpm len=0 
' 0018     21 LABEL : Cell Value, String Constant - LpRJDp len=0 
' 0018     32 LABEL : Cell Value, String Constant -        hidden len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00|y\xccy\xb5\x00\xb5\x00'
' 0018     21 LABEL : Cell Value, String Constant - MWCbpp len=0 
' 0018     20 LABEL : Cell Value, String Constant - nFjGo len=0 
' 0018     19 LABEL : Cell Value, String Constant - OaLj len=0 
' 0018     21 LABEL : Cell Value, String Constant - obgEBN len=0 
' 0018     18 LABEL : Cell Value, String Constant - OGr len=0 
' 0018     32 LABEL : Cell Value, String Constant -        hidden len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00\xb1\xc3\xd0\xc3{\x00{\x00'
' 0018     19 LABEL : Cell Value, String Constant - OmSL len=0 
' 0018     19 LABEL : Cell Value, String Constant - oTZO len=0 
' 0018     18 LABEL : Cell Value, String Constant - Ovv len=0 
' 0018     20 LABEL : Cell Value, String Constant - pcJVu len=0 
' 0018     21 LABEL : Cell Value, String Constant - PFjlrL len=0 
' 0018     21 LABEL : Cell Value, String Constant - Pheprr len=0 
' 0018     18 LABEL : Cell Value, String Constant - Pne len=0 
' 0018     34 LABEL : Cell Value, String Constant -          hidden len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00\xb7$\xd7$\xbc\x00\xbc\x00'
' 0018    
... (truncated)

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