Office (OLE) malware analysis — malicious · ef81bcaccfd1c6af

MALICIOUS

Office (OLE)

881.0 KB Created: 2014-12-02 01:30:00 Authoring application: Microsoft Office Word First seen: 2018-06-21

MD5: 2ea06433f5ae3bffa5896100d5361458 SHA-1: 326257f750def9b87ffbfccbc5ea27135c6678f1 SHA-256: ef81bcaccfd1c6af5c7971e5b09a2992046c09651c5ef3ee897eaeaa064cda08

504 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a Microsoft Word document that exploits CVE-2007-3899 to execute arbitrary code. It contains an embedded OLE package that drops a PE executable and attempts to download a second-stage payload from suspicious URLs. The embedded executable, 'embedded_office_00004e6f.exe', is the primary payload.

Heuristics 13

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-6519332-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-6519332-0
Embedded PE executable critical OLE_EMBEDDED_EXE

MZ/PE header found inside document — possible embedded executable
Ole10Native package payload is a download-and-execute script critical OFFICE_PACKAGE_SCRIPT_DROPPER

The OLE Package's embedded payload contains a script that hosts a shell (PowerShell/WScript/mshta), fetches a remote resource, and executes it — a download-and-run dropper. Embedding such a script inside an Office document via the Object Packager is a direct user-execution delivery technique (MITRE T1204.002), not a benign attachment.
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://ocsp.thawte.com0 Embedded OLE package script
- http://ts-ocsp.ws.symantec.com07Embedded OLE package script
- http://crl.thawte.com/ThawteTimestampingCA.crl0Embedded OLE package script
- http://ts-aia.ws.symantec.com/tss-ca-g2.cer0Embedded OLE package script
- http://ts-crl.ws.symantec.com/tss-ca-g2.crl0(In document text (OLE body)
- http://schemas.openxmlformats.org/officeDocument/2006/bibliographyIn 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)
- http://ts-crl.ws.symantec.com/tss-ca-g2.crl0Embedded OLE package script

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_office_00004e6f.exe`	embedded-pe	Office MZ+PE at offset 0x4E6F	882065 bytes
SHA-256: `17a2ae11f2eb69fa84d3e8e49508b6ec37beda7578820ba96a7f0adcbc5e2aaa`
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/_1482835173/Ole10Native	857639 bytes
SHA-256: `dcf6d6c08c828d4f6ab78cf0a066c3fa5bb0e7241793e71ec410fa2be61d610a`
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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