Office (OLE) malware analysis — malicious · 9bca05cc8b5e9e38

MALICIOUS

Office (OLE)

264.0 KB Created: 2017-07-30 23:39:00 Authoring application: Microsoft Office Word First seen: 2017-08-08

MD5: c7504b086b56c0d591faf40df3d0ea7d SHA-1: c590077421a46faf3a09659f5882c1efd374d8fa SHA-256: 9bca05cc8b5e9e38596219fd40b3eb5d554c5802d8f2bb796009d84eb078f6f1

442 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a Microsoft Word document that contains a lure suggesting it needs conversion, likely to trick the user into executing an embedded PE executable. Heuristics indicate the exploitation of CVE-2007-3899 and the presence of an embedded executable, which is a common dropper technique. The embedded executable is the primary payload, and the document itself acts as a lure to facilitate its execution.

Heuristics 10

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-6334570-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-6334570-0
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
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	256331 bytes
SHA-256: `52aadb9b6532d70cfb2a8ada3959dd734a8f619ce50ebc991f6b585afd8ee2ce`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.51, consistent with packed or encrypted content.
`ole10native_00.bin`	ole-package	OLE Ole10Native stream: ObjectPool/_1562966718/Ole10Native	252336 bytes
SHA-256: `5933c3068753e4cc00a4d9940acbef0dd071953fa676a99f22ff4addacfc871b`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.57, consistent with packed or encrypted content.

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