Office (OLE) / .DOC malware analysis — malicious · 4d71f1eab01045de

MALICIOUS

Office (OLE) / .DOC

495.0 KB Created: 2020-03-19 08:06:00

MD5: 555fe4685033cb33b6508acb3f463be9 SHA-1: 7b3b5fad119bb2a492385e9f98cfacdf94f9f09e SHA-256: 4d71f1eab01045de9ae76ea248be7746bad70c12ad977eeb6e8f8e46bbce6395

508 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample contains VBA macros, including an AutoOpen macro, which are designed to execute automatically when the document is opened. Heuristics indicate the use of CreateProcess, VirtualAlloc, WriteProcessMemory, and CreateRemoteThread APIs, suggesting the macro likely downloads and executes a second-stage payload. The document body discusses COVID-19 travel restrictions, a common lure to trick users into enabling macros.

Heuristics 14

Reference to WriteProcessMemory API critical SC_STR_WRITEPROCESSMEMORY

Reference to WriteProcessMemory API
Reference to CreateRemoteThread API critical SC_STR_CREATEREMOTETHREAD

Reference to CreateRemoteThread API
ClamAV: Doc.Malware.Valyria-10012625-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Valyria-10012625-0
Reference to CreateProcess API high SC_STR_CREATEPROCESS

Reference to CreateProcess API
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
Auto_Open macro high OLE_VBA_AUTO

Auto_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject 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.
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.openxmlformats.org/officeDocument/2006/bibliography
- http://schemas.openxmlformats.org/officeDocument/2006/customXml

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `f15dd03bf0d3d105a53f88fc9869b79fd9f8078c00b02d579bdda43a2030788f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	27166 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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