Office (OLE) / .DOC malware analysis — malicious · 0271e462c85ac68f

MALICIOUS

Office (OLE) / .DOC

973.0 KB Created: 2021-05-19 11:37:00 Authoring application: Microsoft Office Word

MD5: 4d0bfbb8b9d68d1304ab5551672e3eb7 SHA-1: 4a5461e3d50002965559511bcb29c0e98245adda SHA-256: 0271e462c85ac68f34406bc9ad70fa3fbf8bdf0c8b94f3219c07c76d543611ad

502 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing a VBA macro that executes upon opening. The macro attempts to find and execute an embedded PE executable named 'fax.f' (which is renamed to 'zs.z' in the startup directory) using 'rundll32.exe'. This indicates a clear intent to download and execute a second-stage payload, likely for further system compromise.

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` `56cd0bc65cfcc9b4bdb44594a7764039bf22c968e044c8aae031b35fbaa84dd1`	embedded-pe	Office MZ+PE at offset 0x8EC68	411544 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` `0b889b5de6de15e22c944e86f6e5f734b0c1ea194bcc222633ec6c689d65ddf0`	ole-package	OLE Ole10Native stream: ObjectPool/_1682904495/Ole10Native	385306 bytes

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