RTF malware analysis — malicious · 9e881b9fd076c5ed

MALICIOUS

RTF

727.1 KB Created: 2018-02-07 20:04:00 First seen: 2018-02-19

MD5: f9cd8b7a912cb8aa28b6bbfd168d554d SHA-1: 6610e605c5979b9dbc2e2dee8b5bfa859ab25e70 SHA-256: 9e881b9fd076c5ed1b3b055b9d794949b4951ef46642a2d48a477d2fe8fbd243

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, which is indicative of exploiting vulnerabilities like CVE-2017-8759 for client execution. ClamAV detections further confirm its malicious nature, flagging it as Doc.Macro.Obfuscation. The primary attack vector is likely spearphishing attachment, with the embedded OLE object serving as the mechanism to download and execute 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.
ClamAV: Xls.Malware.Valyria-6934880-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Valyria-6934880-0
\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.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002c4a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2C4A	22587 bytes
SHA-256: `0da6288202afc879c220adc11c3c1455260f38b739bb67a73bc25135bab26d78`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_01_off00013d30.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x13D30	22587 bytes
SHA-256: `627518d7f6ac00a2b67ae878b541ece79b872f30e8aa35fb49e5b0db399f6dce`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_02_off0002501f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2501F	22587 bytes
SHA-256: `7b54c697d7717f1714dcaa1711e15ea209b03e8f8297d87712ced0f7fc28b075`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_03_off00036310.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x36310	22587 bytes
SHA-256: `988982f07dbaba21e1a42afda709f317230d33bb6622f585263fa786659bfd15`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_04_off00047601.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x47601	22587 bytes
SHA-256: `f16ffc23ed204bf28fd53ca11175d084a58f00cf133fee4b96a6e4e85d12fc28`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_05_off0005891a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x5891A	22587 bytes
SHA-256: `478099e8005c59daeb24935224c258e62e9fdb9aba94bdff8ed713b107383c53`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_06_off00069977.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x69977	22587 bytes
SHA-256: `cc26a9f4e657a0adf931af4903fe0edcdfd042f8565137228d49b484c6a07b7d`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_07_off0007ac68.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x7AC68	22587 bytes
SHA-256: `1f219555c5f13283b014e908b5aff77160169673199b9a84ad413979e3cc355b`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_08_off0008bf59.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8BF59	22587 bytes
SHA-256: `27f3fa48f817b384997651486d585c26587bdb6d8c30c8e51090d5e4467562f7`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_09_off0009d24a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x9D24A	22587 bytes
SHA-256: `77908312483a96817f546d1ee2b1871b9209d0fd7d153c0391717057bf398784`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely

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