Malicious Office (OOXML) / .DOC — malware analysis report

Static analysis result for SHA-256 74ba500ed48a230b…

MALICIOUS

Office (OOXML) / .DOC

22.1 KB Created: 2017-10-24 07:54:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: ab88bef8a85aae29dbd6efc3137f227f SHA-1: c67dc0a198126f2fb1f006801e3e40bab43681c7 SHA-256: 74ba500ed48a230b7da3f057d2e114267f283b32ccb8bc3e56e16a0c11ab722b
422 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

This document contains VBA macros that are designed to execute a PowerShell command. The PowerShell command is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The presence of AutoOpen and Document_Open macros indicates an attempt at automatic execution upon opening the document. The ClamAV detection 'Doc.Downloader.Pwshell-10001336-0' further supports the malicious nature of this file as a downloader.

Heuristics 10

  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  • ClamAV: Doc.Downloader.Pwshell-10001336-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Pwshell-10001336-0
  • 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.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • 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.learnobots.com/
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas
    • http://schemas.microsoft.com/office/drawing/2014/chartex
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartex
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2010/wordml
    • http://schemas.microsoft.com/office/word/2012/wordml
    • http://schemas.microsoft.com/office/word/2015/wordml/symex
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroup
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInk
    • http://schemas.microsoft.com/office/word/2006/wordml
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShape
    • https://goo.gl/maps/RDFPZozWE3F2
    • https://goo.gl/maps/NbrXDy7TLf92
    • https://docs.google.com/forms/d/e/1FAIpQLSdWyRMsFlxN_50fTVwUmuFL96535HcS_IxD8ioBdFQhXLLf5A/viewform?c=0&w=1

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
893c0456700268e2396fe010bdca5126d2b64d750da8816d19517385398fe2ba		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 4655 bytes
vbaProject_00.bin
f95b46bec8cff252fa3d6c8723e2e10a864a3d94ea138949bd788b8d7abb24a5		 vba-project OOXML VBA project: word/vbaProject.bin 18944 bytes
Detection
ClamAV: Doc.Downloader.Pwshell-10001336-0
Obfuscation or payload: unlikely

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