RTF malware analysis — malicious · 1773b67b847dd662

MALICIOUS

RTF

2.74 MB Created: 2018-05-21 15:22:00 First seen: 2019-04-18

MD5: 0323d7faecd3d037355431c6a8140e91 SHA-1: aa89f28645bc823fdda412dac0414b2019ed811a SHA-256: 1773b67b847dd662494d429a95e0b95af7373843d1984eda03d344bcdee193a7

562 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains embedded OLE objects, including one that exploits CVE-2017-8759. This vulnerability allows for the execution of arbitrary code, likely to download and run a secondary payload. The presence of PE headers within the hex-encoded data and ClamAV detections for Win.Packer.MalwareCrypter-6620810-1 further indicate malicious intent.

Heuristics 13

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759

RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM

RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
ClamAV: Win.Packer.MalwareCrypter-6620810-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Packer.MalwareCrypter-6620810-1
PE header (with DOS stub) in hex data critical RTF_MZ_HEX

Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
\objupdate forces OLE activation high RTF_OBJUPDATE

RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
Package object class high RTF_OBJCLASS_PACKAGE

OLE Package object — can wrap arbitrary files
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~2603KB of hex-encoded data inside \objdata sections — may hide a payload
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.
OLE object data medium RTF_OBJDATA

RTF contains 2 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAM

RTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.
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.microsoft.com In RTF body
- https://support.google.com/chrome/?p=usage_stats_crash_reportsIn RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002a89.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2A89	1301505 bytes
SHA-256: `24ad09bf489960f89ef946ad80af7f358a97b021a38106450cef4f99638c0a5e`
Detection ClamAV: Win.Packer.MalwareCrypter-6620810-1 Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_PEB_ACCESS, SC_STR_LOADLIBRARY, SC_STR_GETPROCADDRESS Static shellcode analysis recovered API/import strings: LoadLibraryA, GetProcAddress, kernel32.dll, KERNEL32.DLL, LoadLibraryExA, VirtualAlloc
`objdata_01_off00299058.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x299058	23598 bytes
SHA-256: `8f904e574213c35cd994c7062c537f9c29e94c576775490c1ffc540f1deb770d`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_PEB_ACCESS Static shellcode analysis recovered command string(s): cmd.exe /c calc %

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