Office (OLE) malware analysis — malicious · 57e7dfed3a2b85dd

MALICIOUS

Office (OLE)

748.5 KB Created: 2018-02-20 17:05:00 Authoring application: Microsoft Office Word First seen: 2018-03-04

MD5: aba7aa6b633a49100eea8ac70d66e956 SHA-1: 0e47a4a193369b9fa14a4eab99f618a74c1c53b9 SHA-256: 57e7dfed3a2b85dd9649d67a0c2c39b9b5026c0669ed55e1928d575ccd847cb1

562 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a Microsoft Word document containing an embedded executable payload, identified by the 'OLE_EMBEDDED_EXE' heuristic. The document body suggests a conversion process, which likely triggers the execution of the embedded file. The presence of 'ShellExecute' and 'LoadLibrary' API calls, along with the 'OFFICE_PACKAGE_SCRIPT_DROPPER' and 'OFFICE_PACKAGE_RISKY_FILE' heuristics, indicates that the embedded executable is designed to download and execute further malicious content.

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_0000d864.exe`	embedded-pe	Office MZ+PE at offset 0xD864	711068 bytes
SHA-256: `905a3599df75a7a23b5d9a0392e0ae6ab09dac46b3b2b07ced64d80dd39ad56c`
Detection ClamAV: Win.Exploit.Bypassuac-9883294-0 Obfuscation or payload: likely Carved artifact entropy is 7.86, consistent with packed or encrypted content.
`ole10native_00.bin`	ole-package	OLE Ole10Native stream: ObjectPool/_1580655067/Ole10Native	705563 bytes
SHA-256: `ae1f5ee2ea25bae1bd41d216d03f9da34716caea0109e246bc96992c2f9c84c7`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.86, consistent with packed or encrypted content.

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