RTF malware analysis — malicious · b026eb7fd3853998

MALICIOUS

RTF

29.0 KB First seen: 2023-06-06

MD5: dd47f33b56454960f38b861eaafcac6d SHA-1: fb3bce82df125ced53a0ef72b267599a9ad26fe2 SHA-256: b026eb7fd3853998406036d08ab772352f448f780f70ba77e969a8023527881d

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). The presence of `RTF_OBJDATA`, `RTF_OBJEMB`, `CVE_2017_11882_EQUATION_OLE10NATIVE`, and `RTF_OLE10NATIVE_STREAM` heuristics strongly indicates this exploit. The decoded OLE object is likely a second-stage payload, though its specific nature cannot be determined from the provided evidence.

Heuristics 5

Equation Editor Ole10Native payload — CVE-2017-11882 likely critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE

RTF decodes to an activated Microsoft Equation 3.0 OLE storage whose payload is a high-entropy Ole10Native stream rather than normal Equation Native/MTEF data. This is a weaponized Equation Editor RCE delivery shape consistent with CVE-2017-11882/CVE-2018-0802.
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.
\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 OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001776.bin` `c6b8a96390652f5fe35dd90c73b908211ed5bae02293bc8dad2685f177f02385`	rtf-objdata-decoded	RTF \objdata at offset 0x1776	4686 bytes

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