Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 19806e33c6632f97…

MALICIOUS

Office (OLE) / .XLS

35.5 KB Created: 2014-01-21 03:20:12 Authoring application: Microsoft Macintosh Excel
MD5: c4b991bc3d50629641b998b6c1b6f0d3 SHA-1: 7aab528990fbd81689b327ea9f0a8d5523d5deda SHA-256: 19806e33c6632f973c0e68cf021afeaf3305e3c6995e3b99fd7ae700f4a7a760
382 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample is an Excel file containing a VBA macro with an auto_open subroutine. This macro utilizes the URLDownloadToFile API to download an executable from 'http://www.7-zip.org/a/7z1800-x64.exe' and saves it as 'C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup\AUTORUN_AFTER_REBOOT.exe', establishing persistence. Several other suspicious URLs were also extracted.

Heuristics 9

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
  • ClamAV: Ole2.Macro.Agent-9858828-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Ole2.Macro.Agent-9858828-0
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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 macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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://10.40.56.3/MA_Samples/notepad.exe
    • http://utilzone.topguide.co.kr/update/UZ82/UZU1018.exe
    • http://w1.loxa.com.tw/s846318/GAME2/picaball.exe
    • http://na-us1.disk-tools.com/request?p=b7b3149e8d5bfb243bccb976446d1f1d/DTLite4481-0347.exe
    • http://172.22.4.11/Dtas_virus/Mike/notepad.exe
    • http://www.7-zip.org/a/7z1800-x64.exe

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
4a288ea023c25729403d374e602a721fb63c1b6ad86ee04556dd6b770695e4e4		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3259 bytes

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