Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7956b17d7b8bab94…

MALICIOUS

Office (OLE)

113.5 KB Created: 2013-06-26 21:17:59 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 58e47b0c6950331f415fe0794c802fad SHA-1: b97a8647ead6996dafec8bce67ab9216b78a53dd SHA-256: 7956b17d7b8bab9498bd0d14a85fde8fbeb6f6411eabd73ca12fa8a5b355f6d8
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code upon opening the document. The document body displays a "DOCUMENT PROTECTED!" message, urging the user to enable editing and content, which is a typical lure for macro-based attacks.

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) 57936 bytes
SHA-256: 78633598537ed31ec15b639927b53126eeeba6b471fb8c46c6897d3eb3d9e666
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 -  IX5I1km5BlwOiCLVI
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open hidden len=7 ptgRef3d  Sheet!DU33916 
' 0018     20 LABEL : Cell Value, String Constant - BemOo len=0 
' 0018     33 LABEL : Cell Value, String Constant -         hidden len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00\xb1\x9d\xd0\x9dK\x00K\x00'
' 0018     18 LABEL : Cell Value, String Constant - BGQ len=0 
' 0018     36 LABEL : Cell Value, String Constant -            hidden len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00\xa5\x9b\xc5\x9b<\x00<\x00'
' 0018     20 LABEL : Cell Value, String Constant - bSEDu len=0 
' 0018     21 LABEL : Cell Value, String Constant - CAnhuz len=0 
' 0018     20 LABEL : Cell Value, String Constant - CbwXB len=0 
' 0018     20 LABEL : Cell Value, String Constant - CTmUH len=0 
' 0018     20 LABEL : Cell Value, String Constant - cwCAA len=0 
' 0018     20 LABEL : Cell Value, String Constant - cxYJp len=0 
' 0018     20 LABEL : Cell Value, String Constant - DMsiv len=0 
' 0018     21 LABEL : Cell Value, String Constant - dRBCup len=0 
' 0018     20 LABEL : Cell Value, String Constant - dtSGe len=0 
' 0018     20 LABEL : Cell Value, String Constant - eOyxP len=0 
' 0018     29 LABEL : Cell Value, String Constant - eupSHrp hidden len=7 ptgRef3d  Sheet!DU33916 
' 0018     20 LABEL : Cell Value, String Constant - fcGTh len=0 
' 0018     20 LABEL : Cell Value, String Constant - fkstC len=0 
' 0018     19 LABEL : Cell Value, String Constant - froE len=0 
' 0018     21 LABEL : Cell Value, String Constant - FrYvTQ len=0 
' 0018     18 LABEL : Cell Value, String Constant - Fuj len=0 
' 0018     19 LABEL : Cell Value, String Constant - gDTg len=0 
' 0018     20 LABEL : Cell Value, String Constant - GjFti len=0 
' 0018     19 LABEL : Cell Value, String Constant - GJzz len=0 
' 0018     21 LABEL : Cell Value, String Constant - GoGTTH len=0 
' 0018     19 LABEL : Cell Value, String Constant - Hdfn len=0 
' 0018     18 LABEL : Cell Value, String Constant - Hnd len=0 
' 0018     19 LABEL : Cell Value, String Constant - HOCZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - hXqfU len=0 
' 0018     18 LABEL : Cell Value, String Constant - ibv len=0 
' 0018     21 LABEL : Cell Value, String Constant - ihSiwX len=0 
' 0018     21 LABEL : Cell Value, String Constant - ILJBSs len=0 
' 0018     18 LABEL : Cell Value, String Constant - Jca len=0 
' 0018     20 LABEL : Cell Value, String Constant - JGQdV len=0 
' 0018     18 LABEL : Cell Value, String Constant - jJu len=0 
' 0018     21 LABEL : Cell Value, String Constant - jJXbDV len=0 
' 0018     18 LABEL : Cell Value, String Constant - JLV len=0 
' 0018     18 LABEL : Cell Value, String Constant - jTw len=0 
' 0018     18 LABEL : Cell Value, String Constant - kDk len=0 
' 0018     20 LABEL : Cell Value, String Constant - KfVyH len=0 
' 0018     19 LABEL : Cell Value, String Constant - klvM len=0 
' 0018     19 LABEL : Cell Value, String Constant - LDdP len=0 
' 0018     18 LABEL : Cell Value, String Constant - lDs len=0 
' 0018     20 LABEL : Cell Value, String Constant - LEfOY len=0 
' 0018     21 LABEL : Cell Value, String Constant - lupGMB len=0 
' 0018     20 LABEL : Cell Value, String Constant - lxOGz len=0 
' 0018     18 LABEL : Cell Value, String Constant - mDh len=0 
' 0018     21 LABEL : Cell Value, String Constant - mkfJCF len=0 
' 0018     21 LABEL : Cell Value, String Constant - MKnKTh len=0 
' 0018     20 LABEL : Cell Value, String Constant - mMSuS len=0 
' 0018     19 LABEL : Cell Value, String Constant - npox len=0 
' 0018     18 LABEL : Cell Value, String Constant - oCv len=0 
' 0018     21 LABEL : Cell Value, String Constant - OeTppH len=0 
' 0018     18 LABEL : Cell Value, String Constant - oGX len=0 
' 0018     19 LABEL : Cell Value, String Constant - OPFk len=0 
' 0018     21 LABEL : Cell Val
... (truncated)

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