RTF malware analysis — malicious · ffaa6e86c13b9bb1

MALICIOUS

RTF

655.7 KB Created: 2019-02-17 16:41:00 First seen: 2019-02-26

MD5: c23c24b78bfe16786bdb656aecd57b14 SHA-1: 4cc3b3be5a10d60c359e77614b7d8ab7d54a5d78 SHA-256: ffaa6e86c13b9bb1952b42d07d9c94882e27bc3b0cfe51e81b310a7fd0a5b29b

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple embedded OLE objects, with a critical heuristic firing for CVE-2017-8759, indicating exploitation of MSXML SAX OLE activation. The ".objupdate" directive forces OLE activation, suggesting the embedded objects are intended to be executed. This points to a likely attack pattern involving the exploitation of this vulnerability to deliver a secondary payload.

Heuristics 6

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.
\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.
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 5 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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/office/word/2003/wordml In RTF body

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00024e42.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x24E42	37422 bytes
SHA-256: `1616f271d99636b030307abf520dc210ed0de5accaae5941737b4b46491ff453`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_01_off0003cd16.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3CD16	37422 bytes
SHA-256: `6ca2e145fd1fee1abe011a43a4c6e19f2bdac1d56adb559d5e76f13c63f711e1`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_02_off00054bea.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x54BEA	37422 bytes
SHA-256: `6b00659213695bdbd2e78041450403b6794861545c7fdfe25f60c071a731ee80`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_03_off0006cabe.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x6CABE	37422 bytes
SHA-256: `6dbe9791dcdec9c632cd5c4f9be15a3e6ecb5c2b43ee18991ff035fd8d1a0a23`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_04_off00084992.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x84992	37422 bytes
SHA-256: `53c1a9d25a7cf4902c18c7f15863140bcc7c2b0c270766df1f29796670b4bcd1`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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