Office (OLE) / .DOC malware analysis — malicious · d735febefeef8650

MALICIOUS

Office (OLE) / .DOC

197.0 KB Created: 2010-02-18 15:20:00 Authoring application: Microsoft Office Word

MD5: 0687a58ddcb20e025549a39e3113ff0a SHA-1: 5997fdf605a0d130d698a6c0cf8e93688fca256e SHA-256: d735febefeef865048e10f86c1c5c14b438669481cd479b988e25b87acd0f961

382 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is a Microsoft Word document containing an embedded Portable Executable (PE) file, identified by the 'OLE_EMBEDDED_EXE' heuristic. The document body simply states 'EMBED Package', suggesting a lure to execute the embedded file. The embedded PE file was detected by ClamAV as 'Win.Trojan.Netbus-15'. The presence of API calls like ShellExecute, VirtualAlloc, VirtualProtect, LoadLibrary, and GetProcAddress within the document's OLE structure further indicates malicious intent, likely related to the execution and manipulation of the embedded payload.

Heuristics 10

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.
Embedded PE executable critical OLE_EMBEDDED_EXE

MZ/PE header found inside document — possible embedded executable
ClamAV: Win.Trojan.Netbus-15 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Netbus-15
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_office_00003476.exe` `2b67dc3a0e20f7fd088b9fe3fe5126e62ae26d2778dff465fd2962f86d04dc4a`	embedded-pe	Office MZ+PE at offset 0x3476	188298 bytes
Detection ClamAV: Win.Trojan.Netbus-15 Obfuscation or payload: likely Carved artifact entropy is 7.86, consistent with packed or encrypted content.
`ole10native_00.bin` `6d694baf80bc3b9472c69c3293cdf7c55de8081eb3084c529ebc4f7def10990f`	ole-package	OLE Ole10Native stream: ObjectPool/_1328015237/Ole10Native	182392 bytes
Detection ClamAV: Win.Trojan.Netbus-15 Obfuscation or payload: likely Carved artifact entropy is 7.93, consistent with packed or encrypted content.

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