Office (OLE) malware analysis — malicious · 2a148f46e1da672e

MALICIOUS

Office (OLE)

273.5 KB Created: 2017-08-01 23:14:00 Authoring application: Microsoft Office Word First seen: 2017-08-08

MD5: b18e58201dc4769e4c77df7b0ec32524 SHA-1: d6db967599f556bb3c4ed8ad1ba59a498cfe5b55 SHA-256: 2a148f46e1da672e13b3e71b0d39a30c2fb784b1cdf3fef8908ba1a6fa868f14

562 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1105 Ingress Tool Transfer

The sample is a Microsoft Word document that exploits CVE-2007-3899 to drop and execute a PE executable. The document body suggests a compatibility pack lure to trick the user into opening the embedded package. The embedded PE executable, detected by ClamAV as Win.Exploit.Bypassuac-9883294-0, is likely responsible for the malicious payload delivery.

Heuristics 11

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: Win.Exploit.Bypassuac-9883294-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Exploit.Bypassuac-9883294-0
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
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_office_000036b5.exe`	embedded-pe	Office MZ+PE at offset 0x36B5	266059 bytes
SHA-256: `d3691be7899f2a421334b1b1627d0ff8f4b0ed9d53d65bcd24b820feb51caa12`
Detection ClamAV: Win.Exploit.Bypassuac-9883294-0 Obfuscation or payload: likely Carved artifact entropy is 7.54, consistent with packed or encrypted content.
`ole10native_00.bin`	ole-package	OLE Ole10Native stream: ObjectPool/_1563138019/Ole10Native	261781 bytes
SHA-256: `4c981cd985b0a8947840df75b0b0094d867fd046ead955a0bc419eb98c7bf92f`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.59, consistent with packed or encrypted content.

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