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

Static analysis result for SHA-256 1a344f443cb63b15…

MALICIOUS

Office (OLE) / .XLS

957.0 KB Created: 2019-08-30 09:14:50 Authoring application: Microsoft Excel
MD5: 501b86caaa8399d508a30cdb07c78453 SHA-1: c9697519bb364bb1d5b6aca6793e6cee10b853cf SHA-256: 1a344f443cb63b15248b6ec7b7dcfe4d3b9cb68fa7ffd8cce0415963d0c81d62
400 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command and Shell T1105 Ingress Tool Transfer T1204.002 Malicious File

This XLS file contains VBA macros that utilize Windows Script Host and calls to VirtualAlloc, LoadLibrary, and GetProcAddress, indicating the execution of malicious code. A PE executable is embedded within the document, and ClamAV detections confirm its malicious nature as a dropper. The macro's likely intent is to download and execute a second-stage payload from the unknown URL.

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: Xls.Dropper.Agent-7615802-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7615802-0
  • 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
9fa42df3a7923a4e4f61d5d41f1b487ec888e0898f7c9403ffbdeaba0076922c		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 13371 bytes
embedded_office_00004541.exe
d110f2f69187510f74aa6d289ef7b268cea3db5099ef8436c5983a775acde792		 embedded-pe Office MZ+PE at offset 0x4541 962239 bytes
Detection
ClamAV: Win.Dropper.Hideproc-6663113-0
Obfuscation or payload: unlikely
ole10native_00.bin
36ddffc5f70b871833a11e7e33ef16143676d283bdba00c1acb678f57ef19c33		 ole-package OLE Ole10Native stream: MBD0072D3E6/Ole10Native 647437 bytes

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