Office (OLE) / .DOCX malware analysis — malicious · 0b22278ddb598d63

MALICIOUS

Office (OLE) / .DOCX

1.27 MB Created: 2021-05-24 12:32:00 Authoring application: Microsoft Office Word

MD5: 14f4c470c207e22c3b0a4efa7b4200e8 SHA-1: 21180195396580a9ade32b589490cf3bc94d3b5b SHA-256: 0b22278ddb598d63f07eb983bcf307e0852cd3005c5bc15d4a4f26455562c8ec

542 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains a VBA macro with a Document_Open subroutine that uses the Shell() function to execute an embedded PE executable. The macro also searches for a file named 'jax.k' and renames it to 'ket.t' in the startup path, then executes it using 'rundll32.exe'. This indicates a downloader or dropper functionality, aiming to execute a secondary payload.

Heuristics 14

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.
Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Embedded PE executable critical OLE_EMBEDDED_EXE

MZ/PE header found inside document — possible embedded executable
ClamAV: Doc.Downloader.Jrat-6336393-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Jrat-6336393-1
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
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 VirtualAlloc API medium SC_STR_VIRTUALALLOC

Reference to VirtualAlloc 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` `5e458372b4eacd99b55dfb9dd878b8d73a6d16041b2f88dd89494ac82a5a6488`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1535 bytes
`embedded_office_0008f668.exe` `8e04a4a0fb03075e53e5d68faaeab3ee61cdcafe94c9e1479690cc750fcc89c8`	embedded-pe	Office MZ+PE at offset 0x8F668	748440 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`ole10native_00.bin` `1c584606b0c1348cf2955eca391115163ba6cbc3da473b019f21e5a48eeb6a04`	ole-package	OLE Ole10Native stream: ObjectPool/_1683339676/Ole10Native	721178 bytes

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