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

Static analysis result for SHA-256 930830e665432335…

MALICIOUS

Office (OLE) / .XLS

781.0 KB Created: 2019-08-30 09:14:50 Authoring application: Microsoft Excel
MD5: 89bf7b0979912c83c3bc874a24b1ff24 SHA-1: fa358eb2e92cb8da21dacb140784ef800aa9e628 SHA-256: 930830e6654323351b17c3f13c343f8883cf3ce50cb22e983fb328a10fc94291
400 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an Excel file containing VBA macros that utilize Shell(), VirtualAlloc, LoadLibrary, and GetProcAddress APIs. It also contains an embedded PE executable. The presence of these elements, particularly the embedded executable and the use of Shell(), strongly suggests the macro is designed to download and execute a secondary 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
9081596b183f4796bd9241fc78358e83edeecac0c7e8f7f77e9aaa9badfa1147		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 38455 bytes
embedded_office_00004545.exe
9592366306fd25a92fc9a935661cee589871fd418bf5e9d1d80ace57fa58a17e		 embedded-pe Office MZ+PE at offset 0x4545 782011 bytes
Detection
ClamAV: Win.Dropper.Hideproc-6663113-0
Obfuscation or payload: unlikely
ole10native_00.bin
bd1d3d6bced94f974c75d1fdb27aaf6adbdb828da183254e59154adba50222a8		 ole-package OLE Ole10Native stream: MBD00382FB3/Ole10Native 620313 bytes

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