RTF malware analysis — malicious · 0268ec44ae26f99a

MALICIOUS

RTF

4.1 KB First seen: 2019-04-18

MD5: f0e6fb305abf973ab4134f7476ae161b SHA-1: 4f59b36cebc63527e6e5d1015ba2545b08d11ebf SHA-256: 0268ec44ae26f99a6df3779fbbc45a976b3f2a4b1f8e9d7cac851e5adb40a486

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an embedded OLE object with a suspicious Equation Editor ProgID, indicating an attempt to exploit a known vulnerability. The ".objupdate" directive forces OLE activation, which is likely to trigger the execution of embedded shellcode. The extracted artifact 'objdata_00_off000005e0.bin' is the decoded OLE object data.

Heuristics 5

Split hex Equation Editor ProgID + OLE object critical CVE likely RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
Suspicious extracted artifact critical 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.
\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.
OLE object data medium RTF_OBJDATA

RTF contains 1 \objdata section(s) — embedded OLE objects
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
- http://bit.ly/2QxLXBrIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000005e0.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x5E0	1342 bytes
SHA-256: `84104d11fd8ecc15915884635807dbc01501008ae5d7a3fdc7d76c2f48307d45`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered URL(s): http://bit.ly/2QxLXBr

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