RTF malware analysis — malicious · b73989744cd117d2

MALICIOUS

RTF

9.2 KB First seen: 2018-10-07

MD5: 04be4727cc0f4a41524c9afcecc1551c SHA-1: 0cb798dd9ad5f7d906be64e0ccecac024fe08295 SHA-256: b73989744cd117d24704b0c6ca470c358229caa76cceba0fab2c26f8708b2e63

220 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an RTF document containing embedded OLE object data, specifically triggering heuristics related to Equation Editor exploits. ClamAV identifies this as Rtf.Exploit.CVE_2017_11882-6584355-1, indicating a known vulnerability exploitation. The presence of ".objupdate" further suggests an attempt to force OLE activation, leading to code execution.

Heuristics 5

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM

RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
\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 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000003c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3C	4662 bytes
SHA-256: `5e709032d65e0023a8adf960aaf03faedf2ab0b26e1972b12cfcbb9022665fa7`

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