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

Static analysis result for SHA-256 9c7940c0eb2c6d59…

MALICIOUS

Office (OLE) / .XLS

832.5 KB Created: 2020-06-22 10:41:03 Authoring application: Microsoft Excel
MD5: 439ac254ab26539ec305b18e10ccc516 SHA-1: c29fb8f9b6d3e13863e67806f6bb1009d0ffe2f6 SHA-256: 9c7940c0eb2c6d59d918c129743f2f44f60ce1c163d900b981535ef237cb2811
560 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The sample is an XLS file containing VBA macros. A critical heuristic firing indicates a Shell() call within a Workbook_Open macro, which is further supported by a critical heuristic for an embedded PE executable. This suggests the macro's intent is to execute the embedded file. ClamAV also detected the file as Win.Dropper.Hideproc-6663113-0, and an extracted artifact was also flagged by ClamAV. The embedded executable is the primary IOC.

Heuristics 14

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Embedded PE executable critical OLE_EMBEDDED_EXE
    MZ/PE header found inside document — possible embedded executable
  • ClamAV: Win.Dropper.Hideproc-6663113-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Dropper.Hideproc-6663113-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Reference to LoadLibrary API high SC_STR_LOADLIBRARY
    Reference to LoadLibrary API
  • Reference to GetProcAddress API high SC_STR_GETPROCADDRESS
    Reference to GetProcAddress API
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC
    Reference to VirtualAlloc API
  • 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://www.w3.org/2000/svg
    • http://www.w3.org/1999/xlink

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
909e96e8bfb32601e8c72ad4c4771a3a5cd7ed258de9281e2a8d66310dbd8567		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 30989 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
embedded_office_00006265.exe
a9a662cc02ed8f14a64dad05df0c3378e2195460c66a4408f3c0121cad751d96		 embedded-pe Office MZ+PE at offset 0x6265 827291 bytes
Detection
ClamAV: Win.Dropper.Hideproc-6663113-0
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
ole10native_00.bin
938a226a0cea765197773a07c303387cd806465ddb346b3850b96578c79ac5f3		 ole-package OLE Ole10Native stream: MBD006D6CCC/Ole10Native 614055 bytes

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