RTF malware analysis — malicious · c83c28add56ec8ca

MALICIOUS

RTF

536.6 KB Created: 2020-02-17 04:22:00 First seen: 2020-06-01

MD5: 60ec80e7e72afa9a24c48517d9e97f4c SHA-1: e12c17f7ef6a92dc855ee571725760d30a183a9b SHA-256: c83c28add56ec8cad23a14155d5d3d082a1166c64ea5b7432e0acaa728231165

92 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple embedded OLE objects, with one specifically triggered by \objupdate, indicating an attempt to execute embedded code. The presence of these objects and the RTF structure strongly suggest an exploit targeting OLE object activation for arbitrary code execution. While the document body discusses COVID-19 statistics, the technical findings point to a malicious intent beyond the document's apparent content.

Heuristics 6

\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 3 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
Suspicious extracted artifact info 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.
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 https://www.who.int/docs/default-source/coronaviruse/situation-reports/20200216-sitrep-27-covid-19.pdf?sfvrsn=78c0eb78_2 In RTF body

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000641b4.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x641B4	62704 bytes
SHA-256: `0ef5664e0ea40e82154a3a6640d9c3e38894cf24708abec2235f73248bece763`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.
`objdata_01_off00082bba.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x82BBA	6847 bytes
SHA-256: `17937ca8ac43b44a71b92f06dbd19e41226b69a4059c40f114ae57341a605b44`
`objdata_02_off00082bd4.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x82BD4	6843 bytes
SHA-256: `977f215b1627ac5e409b6ac8b6c865bbda3d31576fe2a4d27f248a4640b7dec6`

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