Office (OLE) / .DOC malware analysis — malicious · 61e8c6cd4aa4d6da

MALICIOUS

Office (OLE) / .DOC

972.5 KB Created: 2021-05-19 11:33:00 Authoring application: Microsoft Office Word

MD5: 765825a904de40de3afe856f8181cafc SHA-1: bdef278174a7e9f20ef844e5f7fe8f9ff5d982aa SHA-256: 61e8c6cd4aa4d6da76671ebc9441899050672903fa37609deb6dc82e97a6c6a3

502 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing a VBA macro that executes an embedded PE file. The Document_Open macro attempts to copy itself and then execute a file named 'zs.z' using rundll32.exe, which is likely the embedded PE executable. This indicates a downloader or dropper functionality.

Heuristics 14

Office EPRINT stream contains EMF object high CVE related OLE_EPRINT_EMF_OBJECT

OLE ObjectPool contains an EPRINT stream with EMF data. This is rare in normal documents and is CVE-2007-3893/MS07-046-family evidence when paired with Office exploit payload anomalies, but the malformed EMF record is not proven by this rule alone.
OLE with Ole10Native — possible CVE-2026-21514 exploitation high CVE likely CVE_2026_21514

Document contains a Word OLE object with Ole10Native plus executable, PE, or risky remote-link indicators. CVE-2026-21514 exploits OLE metadata validation; this stronger structure is treated as likely exploitation.
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
Reference to LoadLibrary API high SC_STR_LOADLIBRARY

Reference to LoadLibrary API
Reference to GetProcAddress API high SC_STR_GETPROCADDRESS

Reference to GetProcAddress API
Document_Open macro high OLE_VBA_DOCOPEN

Document_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
Reference to VirtualProtect API medium SC_STR_VIRTUALPROTECT

Reference to VirtualProtect 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://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `a90963d5d6c74d486b2956916b800b6ec29cbd6400e3d375efd2c0f312d5e9fa`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1426 bytes
`embedded_office_0008ec68.exe` `421737460b197c8bad98a5d90a0cf0b6933a3c8b56af4842d3ad5b5d0a626bf4`	embedded-pe	Office MZ+PE at offset 0x8EC68	411032 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`ole10native_00.bin` `b7ec169267dac26dbf0d8f6c5bbd5077f70f8f265c6b61887431909b98bac3ab`	ole-package	OLE Ole10Native stream: ObjectPool/_1682904049/Ole10Native	385306 bytes

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