RTF malware analysis — malicious · d6e50183fa5ec5d9

MALICIOUS

RTF

851.6 KB Created: 2017-11-24 19:17:00 First seen: 2019-04-18

MD5: fe96e459b8eccb028d86b50372c2a49a SHA-1: cfe88669d86eef3bce6664411c897696e66498f5 SHA-256: d6e50183fa5ec5d98f7644bcccfc2354897f5151a2f66ec7ad90f981f1a560b1

362 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object that exploits CVE-2017-11882 through the Equation Editor. This exploit is known to facilitate the execution of arbitrary code, likely a second-stage payload. The presence of a PE header within the RTF object data further confirms the embedded malicious executable.

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.
ClamAV: Doc.Exploit.Cve_2017_11882-7570663-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Exploit.Cve_2017_11882-7570663-1
PE header (with DOS stub) in hex data critical RTF_MZ_HEX

Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
\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.
Package object class high RTF_OBJCLASS_PACKAGE

OLE Package object — can wrap arbitrary files
OLE object data medium RTF_OBJDATA

RTF contains 2 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000026d2.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x26D2	411767 bytes
SHA-256: `f551cebe7376c498a53d8c00b3abbce136cc4b4f56be40f9792d6db75ee501e5`
`objdata_01_off000d3045.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xD3045	3546 bytes
SHA-256: `ee7f6ef4521e29b16c43af9aaccb4519119ccf3a1d209a7492d5b680bef1c7e7`

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