RTF malware analysis — malicious · 5ec8051157895db0

MALICIOUS

RTF

3.64 MB Created: 2019-07-09 14:26:00 First seen: 2020-09-15

MD5: eac75017a57ccd441aaad5def9eff71f SHA-1: a8067c1cf39aaba5e8e8cf9f8bbf046ffff5448a SHA-256: 5ec8051157895db02cdbc66970edb502bd96d64de22bdabf650594751ba0807b

222 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE objects with excessive hex-encoded data, and a critical heuristic indicates exploitation of CVE-2017-8759. This suggests the file is designed to exploit this vulnerability to execute arbitrary code, likely by downloading and running a second-stage payload.

Heuristics 7

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1484KB 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 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_off000028ff.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x28FF	363054 bytes
SHA-256: `7deba67ed32799e7b3bb5cea5249d77627348772cd1e13e1e001c9508e1bc29c`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_01_off000bac14.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xBAC14	363054 bytes
SHA-256: `bf25ff40949e510ccb3ac77829cdf3528cc84cf006ac8d0fead24d7a98e661af`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_02_off00172f29.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x172F29	363054 bytes
SHA-256: `a8394d98250c11dc5ec028ddfe7a650242d2221361a13da0c7acc29a822fed22`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_03_off0022b23e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x22B23E	363054 bytes
SHA-256: `39fd55ab21deb27e82826b529841150641bbe2652f69ceb99e490b45c168f653`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_04_off002e3553.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2E3553	363054 bytes
SHA-256: `bffda56e068a4bad9ad21375009466abd1aeea5db186615f76d6f457c060edce`
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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