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

Static analysis result for SHA-256 3d0f72f955c9dc35…

MALICIOUS

Office (OLE) / .XLS

734.0 KB Created: 2019-08-30 09:14:50 Authoring application: Microsoft Excel
MD5: d111f72b36f621ab1218050b7dcd29ae SHA-1: f39b7926e3665d17515af848839be7e025d64d47 SHA-256: 3d0f72f955c9dc35d71be0eca02f80e3aa2699b856f3df17e8b8e7bc637d3109
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 Execution: Malicious File T1105 Ingress Tool Transfer

The presence of VBA macros, critical heuristics for Shell() calls, embedded PE executables, and references to Windows Script Host and memory allocation APIs strongly indicate a malicious dropper. The embedded PE executable is likely the second-stage payload. The single unknown reputation URL is included as a potential command and control or download source.

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
7f88021624327d2667923a3edb809051f93753eedc7801c890b56edd1035c001		 embedded-pe Office MZ+PE at offset 0x44F1 733967 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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