RTF malware analysis — malicious · 7dc5bcd6ee28c64d

MALICIOUS

RTF

232.8 KB First seen: 2019-10-01

MD5: 8e985ef62ed8682df0eef90560b70f1d SHA-1: a968abf29fd8fe5f91c3be387273ed05bdac1303 SHA-256: 7dc5bcd6ee28c64d2317ed24b4b558aa5d7689fe81ff73c81e58362e92b31324

180 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains embedded OLE object data and triggers an ".objupdate" event, indicating an attempt to activate embedded objects. Critical heuristics confirm the presence of the CVE-2017-11882 vulnerability, a known buffer overflow in Microsoft Equation Editor, which is exploited for client execution. No specific family could be identified, but the exploit is the primary indicator of malicious intent.

Heuristics 4

CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882

Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
\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 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	3641 bytes
SHA-256: `3d659d70fe90343b1596ce7b76fc76023bafcb94013740ab0f3a2655e7d9cb96`

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