RTF malware analysis — malicious · 4b8e4d44a0292c75

MALICIOUS

RTF

15.5 KB First seen: 2018-08-05

MD5: bd6ed55f457430d02c4dd13b24d420d9 SHA-1: 20c93a58620cb9b170869fce8d9c295b8ac4535e SHA-256: 4b8e4d44a0292c754995e263260ea66d5a00d878c25b5a5661378b50d1fc60a7

300 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains embedded OLE object data, specifically targeting the Equation Editor with a known exploit for CVE-2017-11882. This exploit allows for the execution of arbitrary code, which is typically used to download and execute a second-stage payload. No specific malware family could be identified from the available evidence.

Heuristics 7

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
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.
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
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_off000019e6.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x19E6	4643 bytes
SHA-256: `373bbdc21d1e5848f4e5e74f93469da90ba4424162428d0b1c778151bbbc97cf`

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