Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 171e3ce5a2e14292…

MALICIOUS

Office (OOXML)

131.7 KB Created: 1997-01-08 22:48:59 UTC Authoring application: Microsoft Excel 14.0300
MD5: 5e8c16802c2a28fc3075e2e347753eba SHA-1: f2a1a11a1094930adf66535ceaad2bd7dda9cdb7 SHA-256: 171e3ce5a2e14292df80bb1a68a8bdfd5d8e5b39d5c5ca359f6fb77726279e75
310 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1071.001 Web Protocols

The sample contains a Workbook_Open VBA macro that utilizes WScript.Shell and CreateObject to execute commands. The macro is designed to download and execute a second-stage payload from the embedded URLs, such as http://27.121.93.114/SR-C/Main/Download/ExcelUpload.aspx. The presence of Shell() and WScript.Shell usage strongly indicates malicious intent, likely to establish further compromise or exfiltrate data.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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 http://27.121.93.114/SR-C/Main/View/OutLineContinueStartOFF.aspx?FileName={0}&Count={1}&User={2
    • http://27.121.93.114/SR-C/Main/View/OutLineContinueFile.aspx
    • http://27.121.93.114/SR-C/Main/Download/ExcelUpload.aspx
    • http://27.121.93.114/SR-C/Main/Download/ExcelUploadCSV.aspx
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo={0}&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/Syoukai.aspx?No={0}&ZenbunFlag=1&Index=0&USERID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/Syoukai.aspx?No={0}&LayoutFlag=1&USERID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=FU10875666&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=FA20165009&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=WO000002019012648A&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=EP000000003653515A&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=SG00011201913402UA&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=FU10583937&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=FA19241283&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=WO000002018096618A&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=EP000000003489150B&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=EP000000003489150A&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=SG00011201901694WA&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=ES000000002832535T&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=FU10513351&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=FA19185183&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=WO000002018211641A&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=EP000000003495278B&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=EP000000003693279A&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=EP000000003495278A&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=SG00011201901660QA&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=WO000002021084651A&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=WO000002021084650A&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=WO000002021059330A&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=WO000002020194933A&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=WO000002018096773A&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=WO000002018055980A&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=SG00011201811619VA&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=WO000002017208758A&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=SG00011201805519UA&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=WO000002016147213A&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=SG00011201706222PA&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=WO000002016038761A&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=WO000002016038760A&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=SG00011201606417XA&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=WO000002014147656A&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=SG00010202009957RA&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=SG00010201903687UA&Index=0&KindUserID=shinfo004
    • http://27.121.93.114/SR-C/Main/View/OutLineTransfer.aspx?KohoNo=SG000000000187374A&Index=0&KindUserID=shinfo004

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
ec46c0cbb028a871f654f61513186c9128df5d1b973c21923051efc74f609a29		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 139850 bytes
vbaProject_00.bin
92fc0d7e45810b9d36f1891854c97896d5bafbbf7772a078ff6ecd469abb4793		 vba-project OOXML VBA project: xl/vbaProject.bin 288768 bytes

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