RTF malware analysis — malicious · af20f3799d73fb3d

MALICIOUS

RTF

818.9 KB Created: 2018-03-31 16:53:00 First seen: 2018-04-12

MD5: 4147b9d3f947f2b4a26b44cbadc4a317 SHA-1: 950d31a45bf098e04ddd0946abc5c74fe9d0602d SHA-256: af20f3799d73fb3d7476bc04890a98c4322b70a902c55c8d4d80696114ef9ada

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 activate these objects. The critical heuristic firing for CVE-2017-8759 confirms exploitation of this vulnerability, which is commonly used to download and execute arbitrary code. The embedded URL is suspicious and likely part of the exploit chain.

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.Macro.Obfuscation-6391394-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Macro.Obfuscation-6391394-0
\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 In RTF body

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002cba.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2CBA	28219 bytes
SHA-256: `9213c1165a1c02635f0bfcacee241f52fd481ccd104b49e0d7c914c6f4e18aef`
Detection ClamAV: Doc.Macro.Obfuscation-6391394-0 Obfuscation or payload: unlikely
`objdata_01_off000163f3.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x163F3	28219 bytes
SHA-256: `4fbfc6bd88f98d7f9f8fd775d0fe83619dcb5e925764c22db8d9d85ebb9881fe`
Detection ClamAV: Doc.Macro.Obfuscation-6391394-0 Obfuscation or payload: unlikely
`objdata_02_off00029b2c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x29B2C	28219 bytes
SHA-256: `eb8d75d9c467b4bfe24576368a3484f5eacb53c7867561db56b9977f12f04608`
Detection ClamAV: Doc.Macro.Obfuscation-6391394-0 Obfuscation or payload: unlikely
`objdata_03_off0003d265.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3D265	28219 bytes
SHA-256: `c58722fd925274e2163a8d2568bc1cd16ce734ad0d00f5b0602228ed5081bbde`
Detection ClamAV: Doc.Macro.Obfuscation-6391394-0 Obfuscation or payload: unlikely
`objdata_04_off0005099e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x5099E	28219 bytes
SHA-256: `5494a29ec21c3229d7b32851b372406e9407dc9257cb4a9941a54f202fd82fb6`
Detection ClamAV: Doc.Macro.Obfuscation-6391394-0 Obfuscation or payload: unlikely
`objdata_05_off00064121.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x64121	28219 bytes
SHA-256: `e6a005d60470ad217383d04a9245c7fe6bb03d0a5455be8b1d0c9fb682c1c448`
Detection ClamAV: Doc.Macro.Obfuscation-6391394-0 Obfuscation or payload: unlikely
`objdata_06_off0007785a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x7785A	28219 bytes
SHA-256: `13de9bfd4580e3d4312123a32fb540d5dc83bddcc1980bdc17e39290ee191b0c`
Detection ClamAV: Doc.Macro.Obfuscation-6391394-0 Obfuscation or payload: unlikely
`objdata_07_off0008af93.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8AF93	28219 bytes
SHA-256: `2d00ec7afb8173b1c685bfc19bff42254791140b031e50b1992cec33d0ba99e9`
Detection ClamAV: Doc.Macro.Obfuscation-6391394-0 Obfuscation or payload: unlikely
`objdata_08_off0009e6cc.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x9E6CC	28219 bytes
SHA-256: `84ecc0cd7a7d54934af55f944ff2d65314db1e6707603512ebf4fde5a29a895d`
Detection ClamAV: Doc.Macro.Obfuscation-6391394-0 Obfuscation or payload: unlikely
`objdata_09_off000b1e05.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xB1E05	28219 bytes
SHA-256: `5046d2481d8b4d89bacdc9fe250896bb8a2335c8d95fac60c59ae817681731fa`
Detection ClamAV: Doc.Macro.Obfuscation-6391394-0 Obfuscation or payload: unlikely

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