Office (OLE) / .DOCX malware analysis — malicious · f28a5799a09b0c08

MALICIOUS

Office (OLE) / .DOCX

1.30 MB Created: 2021-06-23 12:52:00 Authoring application: Microsoft Office Word

MD5: d1faac2c31205b310f8d189f12716a99 SHA-1: 74dec0c267e39b48b3832fd8f47a729e7396a41c SHA-256: f28a5799a09b0c08a171c850e770d0ad4d81b5b70ed589ddea12a7c616405301

662 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample contains a Document_Open VBA macro that executes a second-stage payload. The macro uses ShellExecuteA to run an embedded DLL, 'kikus.dll', which is likely dropped in the user's template path. The presence of an embedded PE executable and ClamAV detections for 'Doc.Downloader.Jrat-6336393-1' and 'Win.Packed.Midie-10008727-0' further confirm its malicious nature. The script's intent is to download and execute a malicious DLL.

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 — 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` `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` `59c32d32329ae6cdb0251f5122c53cd740230af44ce5a8f4a98e2a210158bfb4`	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` `5679d57a2819a8a70bc4fa55ad1f169c306b9a0574a142f03b8ea8dbbee78075`	ole-package	OLE Ole10Native stream: ObjectPool/_1685932986/Ole10Native	738613 bytes

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