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

Static analysis result for SHA-256 7d7da29f205e89e0…

MALICIOUS

Office (OLE) / .XLSX

260.5 KB Created: 2022-11-06 21:57:15 Authoring application: Microsoft Excel First seen: 2022-11-07
MD5: 7741c5e8e90393d32d38f47e1124e747 SHA-1: db9fc93a7da83c731fa5106ba2364c10deb47ec8 SHA-256: 7d7da29f205e89e0cc151943060db1a22b15b95fe5471a83cfd4f3527283d77d
462 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1059.001 PowerShell T1204.002 Malicious File

The VBA macros within this XLSX file contain critical heuristics for Shell() calls, WScript.Shell usage, and HTTP downloads with file saving. The AutoOpen and Workbook_Open subroutines are present, indicating an attempt to execute malicious code upon opening the document. The script downloads a file from http://62.108.40.71/new/PT03605160.exe, which is then likely executed.

Heuristics 11

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • 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: Doc.Dropper.Agent-6412232-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6412232-1
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_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://62.108.40.71/new/PT03605160.exe

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
bf45cda866ca4a3522ed7cc91bf991fc38a79970c381535053ae16e1c333f427		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 109682 bytes

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