RTF malware analysis — malicious · 734f4f280b00829a

MALICIOUS

RTF

722.8 KB Created: 2018-04-27 01:19:00 First seen: 2019-04-18

MD5: 9ee8f249c8013264550fbc16fba90408 SHA-1: 4cd127e1f15ec8739bffbd85ce3ba1ed4511ce54 SHA-256: 734f4f280b00829a07b5736fb29c837a36deff4d8d5bd1145e31d9e17a0aba69

262 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple embedded OLE objects and triggers an ".objupdate" command, indicating an attempt to exploit vulnerabilities. Specifically, the "CVE_2017_8759" heuristic firing strongly suggests exploitation of MSXML SAX OLE activation. This technique is commonly used by droppers to download and execute further malicious content, as indicated by the ClamAV detection of "Doc.Dropper.Agent-6412232-1". The embedded URL, though benign, is part of the RTF structure.

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.
ClamAV: Doc.Dropper.Agent-6412232-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-6412232-1
\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 10 \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 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002c29.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2C29	22075 bytes
SHA-256: `4d377e5fbb4844661c63f8325615306d201e909629a5e76e05a3adb1d34a9552`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_01_off0001343a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1343A	22075 bytes
SHA-256: `42512fa8ab98c33d11ac027a3130b592a50944c8b810f0e59fe8a91fbcbfa636`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_02_off00023bbf.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x23BBF	22075 bytes
SHA-256: `ed075493b11bd9839cba95267f7dc42cca86787ff7c715dc0a6b936f42da69d3`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_03_off00034346.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x34346	22075 bytes
SHA-256: `e3c31fb88075a18e28c3eb66d681f3d3cc55409352a7d7433058fe0ec02bdd30`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_04_off00044b33.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x44B33	22075 bytes
SHA-256: `f0e53e5b6625d5d5c470e4b248084a9ba6e7d6f447f4484426cbd08235f1febe`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_05_off00055344.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x55344	22075 bytes
SHA-256: `9c5afed83497ae1440a89a15c676fcb37af7c538a740723cb7d397b4a7fb48c5`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_07_off00076250.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x76250	22075 bytes
SHA-256: `738f03c22add8262a4abca8b388c4a6ea98952547768a97ce85dcf7003a4df0d`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely
`objdata_09_off0009715e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x9715E	22075 bytes
SHA-256: `93ff574701cdc8c96192ed0f341cea8c836470eb0a949dacddbf8e01dc4df7af`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely

Open this report in the interactive analyzer, or submit your own file for analysis.