Office (OLE) / .DOCX malware analysis — malicious · aab201681afa1260

MALICIOUS

Office (OLE) / .DOCX

864.0 KB Created: 2021-06-22 08:00:00 Authoring application: Microsoft Office Word

MD5: 77b046d9c1b47b2f7263978351d63139 SHA-1: 359059b81e35a0235e5a61045cd4b6bca9f0bdc2 SHA-256: aab201681afa12602340db03d09b75a6642db8d26a4fb2cdec7da6aa01f26984

622 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is a malicious OLE document containing VBA macros. The 'Document_Open' macro is configured to auto-execute and uses 'CreateObject' and 'ShellExecute' API calls, indicating it likely executes the embedded PE executable. The embedded PE file was detected by ClamAV as Win.Trojan.Malwarex-9874388-0. The presence of Ole10Native and an embedded executable suggests a delivery mechanism for a secondary payload.

Heuristics 16

Office EPRINT stream contains EMF object high CVE related OLE_EPRINT_EMF_OBJECT

OLE ObjectPool contains an EPRINT stream with EMF data. This is rare in normal documents and is CVE-2007-3893/MS07-046-family evidence when paired with Office exploit payload anomalies, but the malformed EMF record is not proven by this rule alone.
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.Malwarex-9874388-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Malwarex-9874388-0
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
Document_Open macro high OLE_VBA_DOCOPEN

Document_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Ole10Native package carries executable/script file type high OFFICE_PACKAGE_RISKY_FILE

OLE Package displayName or fullPath ends in an executable or script-capable extension. Even without UI extension spoofing, embedding a runnable payload inside an Office document is a high-risk delivery pattern.
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
Suspicious extracted artifact high 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.
Reference to VirtualProtect API medium SC_STR_VIRTUALPROTECT

Reference to VirtualProtect API
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — context-specific rules above attribute URLs they actually evaluated; this rule lists URLs that were present in the bytes but were not otherwise tied to a specific finding.

URL http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `d271b1325d2e1626b5403f3c48765244b3e012139430d217da2b66e041e6c603`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2695 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`embedded_office_0008ea71.exe` `a15e3046cd92842cef35260e63e9f236a3000d376114f7055d5c1556bec7fe14`	embedded-pe	Office MZ+PE at offset 0x8EA71	300431 bytes
Detection ClamAV: Win.Trojan.Malwarex-9874388-0 Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`ole10native_00.bin` `62cbb764242bb035a2696a01e147c679666a7ec43039a91bd5ab7f5c3bd1ca85`	ole-package	OLE Ole10Native stream: ObjectPool/_1685829054/Ole10Native	258357 bytes
Detection ClamAV: Win.Trojan.Malwarex-9874388-0 Obfuscation or payload: unlikely

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