Office (OLE) malware analysis — malicious · fc3baa526d07f095

MALICIOUS

Office (OLE)

862.0 KB Created: 2014-12-01 20:30:00 Authoring application: Microsoft Office Word First seen: 2018-06-21

MD5: 890c9bb8b257636a6e2081acdfdd6e3c SHA-1: 9fd271d3ca89e680e3344da2282ee1682893332a SHA-256: fc3baa526d07f095fa0a5ae991c76e744a7c3b8184805b756b51a18bda31a3d5

444 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a Microsoft Word document that contains an embedded executable file. It exploits CVE-2007-3899, a memory corruption vulnerability, to facilitate the execution of the embedded PE file. The embedded executable is identified as a dropper by ClamAV, suggesting it is designed to download and execute further malicious payloads.

Heuristics 12

CVE-2007-3899 — Microsoft Word malformed string memory corruption critical CVE likely CVE_2007_3899

Word OLE document has the MS07-060 malformed-string exploit shape: a Word 97-family FIB points to a malformed DOP/string-table region with an abnormal INT_MAX run, inflated text counters, and exploit payload or Mdropper.Z campaign evidence.
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.
ClamAV: Doc.Dropper.Agent-6519257-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-6519257-0
Embedded PE executable critical OLE_EMBEDDED_EXE

MZ/PE header found inside document — possible embedded executable
Ole10Native package drops an auto-executable payload critical OFFICE_PACKAGE_RISKY_FILE

OLE Package displayName or fullPath ends in a directly auto-executable extension (a runnable binary or a script the default shell host runs on double-click). Embedding such a payload inside an Office document has no benign authoring use — it is a malware-delivery dropper.
Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute 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
Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC

Reference to VirtualAlloc API
Reference to VirtualProtect API medium SC_STR_VIRTUALPROTECT

Reference to VirtualProtect API
Suspicious extracted artifact info 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.
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/officeDocument/2006/bibliography In document text (OLE body)
- http://schemas.openxmlformats.org/officeDocument/2006/customXmlIn document text (OLE body)
- http://schemas.openxmlformats.org/drawingml/2006/mainIn document text (OLE body)

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_office_0000566f.exe`	embedded-pe	Office MZ+PE at offset 0x566F	860561 bytes
SHA-256: `0db7c48fb32e4de13057558ef296cde54e37827d44d191062d72430bcab774b7`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.90, consistent with packed or encrypted content.
`ole10native_00.bin`	ole-package	OLE Ole10Native stream: ObjectPool/_1484310332/Ole10Native	845103 bytes
SHA-256: `afa24aa5853bbd4b93ad5562cf1344bfadd2a8f35e4a779ce067396689b1b696`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.90, consistent with packed or encrypted content.

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