Office (OLE) / .DOCX malware analysis — malicious · 445c89cd435e8cee

MALICIOUS

Office (OLE) / .DOCX

986.5 KB Created: 2021-06-24 10:36:00 Authoring application: Microsoft Office Word

MD5: 2f25702198b430cfcfebc55fcde9fd99 SHA-1: c3cfe98a8b2deb783c48ced39b7d358e7425a13c SHA-256: 445c89cd435e8ceefd417b4d8819e91d46049b8530350154b7e68ca351fcdb43

682 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 User Execution: Malicious File T1059.005 Command and Scripting Interpreter: Visual Basic for Applications T1027 Obfuscated Files or Information T1204.001 User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 T1059.003 Windows Command Shell

The sample is a malicious Word document containing a VBA macro that attempts to execute a second-stage payload. The extracted script explicitly uses ShellExecuteA to run 'rundll32' (constructed via string concatenation) to load and execute a DLL named 'kikus.dll' from the user's template path. The presence of an embedded PE executable and shellcode-like API resolution patterns (PEB access, GetProcAddress, LoadLibrary) in the metadata suggests a multi-stage delivery mechanism designed to bypass security controls.

Heuristics 18

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.Packed.Johnnie-10034316-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Packed.Johnnie-10034316-0
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.
PEB access via FS segment (x86) high SC_PEB_ACCESS

PEB access via FS segment (x86)
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
Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN

Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
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` `ad427da8430d0bab4b976c0aa215ff17485db4f0e31aee29dd87b9d86837c45d`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2742 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_0008ee71.exe` `d1fc5bb2d76d2746b182a082bdaec7154f8d0a9d6de15ec4f659a31913a5bc1c`	embedded-pe	Office MZ+PE at offset 0x8EE71	424847 bytes
Detection ClamAV: Win.Packed.Midie-10008727-0 Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`ole10native_00.bin` `18253a0d3d3408fcc044bdbc8fabba6938c6b4062420b401333e1da0c716a5fa`	ole-package	OLE Ole10Native stream: ObjectPool/_1686011037/Ole10Native	384309 bytes
Detection ClamAV: Win.Packed.Johnnie-10034316-0 Obfuscation or payload: unlikely

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