Office (OLE) / .DOCX malware analysis — malicious · 93f512ce023f0aa2

MALICIOUS

Office (OLE) / .DOCX

690.5 KB Created: 2018-08-03 15:14:00 Authoring application: Microsoft Office Word

MD5: ee73a772b72a5f3393d4bf577fc48efe SHA-1: 63f974136c871e0fa4f14932873dd136e0b45aa5 SHA-256: 93f512ce023f0aa20a2a924a520b2ecac19030a0fa85b583c59974d38dfa6a79

368 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1055.012 Process Hollowing T1055.001 Process Injection

The sample is a malicious DOCX file containing VBA macros, indicated by the OLE_VBA_MACROS and OLE_VBA_AUTOOPEN heuristics. The presence of SC_STR_CREATEPROCESS, SC_STR_VIRTUALALLOC, SC_STR_WRITEPROCESSMEMORY, SC_STR_CREATEREMOTETHREAD, SC_STR_LOADLIBRARY, and SC_STR_GETPROCADDRESS heuristics strongly suggests that the VBA macro is attempting to inject code into a running process or execute a new process. The extracted artifact 'macros.bas' is the source of this malicious behavior. The document body is heavily corrupted and unreadable, providing no direct clues to the lure.

Heuristics 11

Reference to WriteProcessMemory API critical SC_STR_WRITEPROCESSMEMORY

Reference to WriteProcessMemory API
Reference to CreateRemoteThread API critical SC_STR_CREATEREMOTETHREAD

Reference to CreateRemoteThread API
Reference to CreateProcess API high SC_STR_CREATEPROCESS

Reference to CreateProcess API
Reference to LoadLibrary API high SC_STR_LOADLIBRARY

Reference to LoadLibrary API
Reference to GetProcAddress API high SC_STR_GETPROCADDRESS

Reference to GetProcAddress API
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
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.
Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC

Reference to VirtualAlloc API
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)
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
- http://schemas.microsoft.com/office/2006/coverPageProps
- http://schemas.openxmlformats.org/officeDocument/2006/customXml
- http://schemas.openxmlformats.org/officeDocument/2006/bibliography

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `87acb089b749e24ebc42dde641fb98f0206f57befc7c9ab24ad2578d30a1c26f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	11233 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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