Office (OLE) / .DOC malware analysis — malicious · e951cfc43d5f45cb

MALICIOUS

Office (OLE) / .DOC

308.4 KB Created: 2019-02-19 16:34:00 Authoring application: Microsoft Office Word

MD5: 4551cac10c7ef916f85a0bc8e186b28f SHA-1: e93af962bfa275d2aca36634441305587442c28a SHA-256: e951cfc43d5f45cbcb1801d71c98a6ea2bff9c42a52eba33c98d39383bbf047a

300 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1218 Signed Binary Proxy Execution T1059 Command and Scripting Interpreter

The sample contains VBA macros, including an AutoOpen macro, which is designed to execute automatically. The critical heuristic OLE_VBA_WMI_PROCESS_CREATE indicates that the macro uses WMI to launch a process, a common technique for executing malicious payloads. The ClamAV detection further confirms its malicious nature as a downloader. No specific family could be identified, but the techniques used suggest a downloader designed to fetch and execute further stages.

Heuristics 8

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.00536d-6862775-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.00536d-6862775-0
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen 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.
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
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://schemas.openxmlformats.org/drawingml/2006/main
- https://client-office365-tas.msedge.net/ab

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `14f62a6263775f506c7cf8d5a95d6baa2a66d1dd64e67d9db64356db8808cdce`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	59414 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 201 Chr/ChrW string-construction calls.

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