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

Static analysis result for SHA-256 93016dc3782dfb8a…

MALICIOUS

Office (OLE) / .XLS

804.5 KB Created: 2019-08-30 09:14:50 Authoring application: Microsoft Excel
MD5: 827968f27c48b6f592a519e5a18572bb SHA-1: fd0d0f2c95a8a87d40f5d4ce066d234b49aadd6e SHA-256: 93016dc3782dfb8a94008f1e4c7df38aa2e1a37b60af135d2e48f266fe0c76ec
400 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Visual Basic T1059.003 Command and Scripting Interpreter: Windows Command Shell T1204.002 Malicious File: User Execution: Malicious File T1105 Ingress Tool Transfer

This XLS file contains VBA macros that are designed to execute an embedded PE executable. The macros utilize Windows Script Host and critical API calls such as VirtualAlloc, LoadLibrary, and GetProcAddress, indicating a dropper or loader functionality. The presence of an embedded PE executable strongly suggests the file's purpose is to download and execute a second-stage payload. The ClamAV detection of 'Win.Dropper.Hideproc-6663113-0' further supports this assessment.

Heuristics 10

  • 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
  • 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.microsoft.com0
    • http://crl.microsoft.com/pki/crl/products/MicrosoftTimeStampPCA.crl0X
    • http://www.microsoft.com/pki/certs/MicrosoftTimeStampPCA.crt0
    • http://crl.microsoft.com/pki/crl/products/MicCodSigPCA_08-31-2010.crl0Z
    • http://www.microsoft.com/pki/certs/MicCodSigPCA_08-31-2010.crt0
    • http://crl.microsoft.com/pki/crl/products/microsoftrootcert.crl0T
    • http://www.microsoft.com/pki/certs/MicrosoftRootCert.crt0

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
aafcaaf90595ab36360aa7ebea1d205f695ebaa4733d161e0344dd0c919faf50		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 14318 bytes
embedded_office_000044f1.exe
33dbc49165a4060ba738900bcf751e409245a63f97c96f16b95be7f7942e33d1		 embedded-pe Office MZ+PE at offset 0x44F1 806159 bytes
Detection
ClamAV: Win.Dropper.Hideproc-6663113-0
Obfuscation or payload: unlikely
ole10native_00.bin
c64dcafa616038fea032c518953dfc75dfdce8774d27a2c205eadd410e71075a		 ole-package OLE Ole10Native stream: MBD0001C810/Ole10Native 611869 bytes

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