Emodldr RTF malware analysis — malicious · 6f506b26a5563be9

MALICIOUS

RTF

1.18 MB Created: 2018-10-04 15:11:00 First seen: 2019-05-16

MD5: fc47b1eabf67072cfac05c658eeb87f6 SHA-1: 52c81a7a17ab87d36f273bfd81606a5417830539 SHA-256: 6f506b26a5563be96bc1b3cac3de410c50e2eeefacbd269a0abcd20824b9ba37

322 Risk Score

Malware Insights

Emodldr · confidence 95%

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple embedded OLE objects with excessive hex-encoded data, indicative of a hidden payload. The critical heuristic firing for CVE-2017-8759 confirms exploitation of this vulnerability for client execution. The ClamAV detection as 'Xls.Malware.Emodldr' strongly suggests the Emodldr family, which is known to use this exploit.

Heuristics 9

CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759

RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED

RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
ClamAV: Xls.Malware.Emodldr-10058834-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Emodldr-10058834-0
\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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1165KB of hex-encoded data inside \objdata sections — may hide a payload
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 3 \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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002915.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2915	185902 bytes
SHA-256: `d2ef3e5250f3c053c15cbc9c8d42f61c616a9b11d630cd01c4bceb5148bf3a91`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_01_off0006393e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x6393E	185902 bytes
SHA-256: `3769f62d441f7b46f4fe7f2002ae3b28dc6f3a345d15ff17cc9538b894c68bc5`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_02_off000c4969.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xC4969	185902 bytes
SHA-256: `bc22e86c4c9377c3a6709946a3a7fb1dbf1c37dca6e5d563eb54dd78601efd19`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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