Jrat Office (OLE) / .DOCX malware analysis — malicious · a1846e364d9d841d

MALICIOUS

Office (OLE) / .DOCX

1.30 MB Created: 2021-06-23 12:48:00 Authoring application: Microsoft Office Word

MD5: 9f174dd5b35ccf01e89a60a910d52d29 SHA-1: 03494cbad60f6e9c25054ace3361ebb7aae84d4e SHA-256: a1846e364d9d841dcf39fe645629f9aded8cfcf07bf7bdf4a6b9915c29212999

662 Risk Score

Malware Insights

Jrat · confidence 95%

MITRE ATT&CK

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

The sample contains VBA macros with a Document_Open auto-exec macro that calls shell execution functions like WinExec and ShellExecute. It also embeds an executable file within an Ole10Native package, which is a known technique for delivering secondary payloads. The ClamAV detection 'Doc.Downloader.Jrat-6336393-1' strongly suggests the Jrat family and a downloader functionality.

Heuristics 17

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: Doc.Downloader.Jrat-6336393-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Jrat-6336393-1
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 WinExec API high SC_STR_WINEXEC

Reference to WinExec API
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 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 — 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` `b63fa2303f27e014e38c8c1471933c1dbb661e0d8d57af7ef2b73e4c07a34a03`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2719 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_0008fa71.exe` `aa9f2a6cdafe46925f73d92b7731baed28c18be3a7755fb1361bc64e22d2e8e8`	embedded-pe	Office MZ+PE at offset 0x8FA71	778127 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` `8dddae0beeca3fe63690182ca5e0848b44c6e2bfeeba1693f419ae2ad6f02ffb`	ole-package	OLE Ole10Native stream: ObjectPool/_1685932532/Ole10Native	738613 bytes

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