Office (OLE) / .DOC malware analysis — malicious · 88a3ee8d1ee2e6b4

MALICIOUS

Office (OLE) / .DOC

973.0 KB Created: 2021-05-19 11:34:00 Authoring application: Microsoft Office Word

MD5: ace4c73a74714b6570d5632750e8a71c SHA-1: 2ec0284e3a9e09e7f41e50a1b14a9e6bb9a12141 SHA-256: 88a3ee8d1ee2e6b4a77d9f9319958bfd92cee968305f9e591fb0ecc0991dcd09

502 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell

The sample contains VBA macros that automatically execute upon opening the document, leveraging the Shell() function. This macro functionality is used to launch an embedded PE executable. The presence of VirtualAlloc, VirtualProtect, LoadLibrary, and GetProcAddress API calls within the VBA code suggests the embedded executable is likely a downloader or payload that requires memory manipulation and dynamic library loading. The OLE structure also indicates potential exploitation of CVE-2026-21514.

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 — context-specific rules above attribute URLs they actually evaluated; this rule lists URLs that were present in the bytes but were not otherwise tied to a specific finding.

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
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`embedded_office_0008ec68.exe` `aa8e86dc5f579af964fa7f3e5a595becb8477f2e9830c984a7adfe8cde3a45ae`	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` `91fc96e8a83a6fc59cd5a66fdc23ac41c525c00035ce1a1563bfaee3868a7675`	ole-package	OLE Ole10Native stream: ObjectPool/_1682904170/Ole10Native	385306 bytes

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