Office (OLE) / .DOCX malware analysis — malicious · 71f093b607c71fda

MALICIOUS

Office (OLE) / .DOCX

864.0 KB Created: 2021-06-22 07:59:00 Authoring application: Microsoft Office Word

MD5: 88cbc0bfd58cff1434159ec338bef320 SHA-1: e24095a95421f5f3025a9c1eb4cc10397798cc67 SHA-256: 71f093b607c71fdafc9c02a8aae82441c500845e5ad46a00f51d10834c5dcbb7

622 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer T1059 Command and Scripting Interpreter

The sample is a malicious Office document containing a VBA macro with a Document_Open auto-execution subroutine. This macro attempts to execute a second-stage payload by calling the ShellExecute API with the command 'run2l32' and a DLL named 'kikus.dll'. The macro also references 'shell32', indicating the use of Windows shell functions for execution. An embedded PE executable was also extracted, further supporting the malicious nature.

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 — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

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
`embedded_office_0008ea71.exe` `3a1dd6ccc4cd41cc32e9d31ec7eabd9ae2253496cb8f8afc61857ed63dd0b0bd`	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` `dcf9d5bc01ce4eafde531555e0adc83de3d0b68b815a5d335c4d80dbd791722a`	ole-package	OLE Ole10Native stream: ObjectPool/_1685828982/Ole10Native	258357 bytes
Detection ClamAV: Win.Trojan.Malwarex-9874388-0 Obfuscation or payload: unlikely

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