Office (OLE) / .DOCX malware analysis — malicious · b52ba95b8603c0aa

MALICIOUS

Office (OLE) / .DOCX

986.0 KB Created: 2021-06-24 10:34:00 Authoring application: Microsoft Office Word

MD5: 45d02365d0a223250f65f29211970b8b SHA-1: 4e63f07bda3c7297d4472dd0b870ad550e4ddbd9 SHA-256: b52ba95b8603c0aa7b11f3aca7fc261c3a8a32ecf69908bff07fd76cf9f562a2

682 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter T1059.003 Scheduled Task/Job T1059.006 User Execution: Malicious File T1105 System Information Discovery T1566.001 Phishing: Spearphishing Attachment T1071.001 Application Layer Protocol: Web Protocols

The file exhibits several indicators of malicious activity, including the presence of an embedded PE executable, VBA macros with execution tokens, and techniques to bypass security protections like DEP. The VBA macro attempts to download and execute a DLL (kikus.dll) using ShellExecute, suggesting a downloader or payload delivery mechanism. The use of techniques like VirtualProtect to modify memory permissions further indicates an attempt to evade security controls. The presence of an XLM macro sheet is a known vector for Office malware. The overall pattern aligns with a macro-based downloader attempting to establish a foothold on the system.

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` `7307e80e5c772960e518a40bde2d86dbe2f70a55049bec4194c271058e8c3c0e`	embedded-pe	Office MZ+PE at offset 0x8EE71	424335 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` `ec569887c62898d0c47dd4dc6aef37013b0070bf23c1904b980f0bd03d0259cc`	ole-package	OLE Ole10Native stream: ObjectPool/_1686010868/Ole10Native	384309 bytes
Detection ClamAV: Win.Packed.Johnnie-10034316-0 Obfuscation or payload: unlikely

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