Xls.Malware.Valyria-10036093-0 RTF malware analysis — malicious · e25e3333db573b70

MALICIOUS

RTF

1.09 MB Created: 2018-04-16 First seen: 2021-02-23

MD5: 4958f718d47061f2e9e2064f8ac94e06 SHA-1: ad83b4e0ab304e9b9b103a696c0239d1c575de4c SHA-256: e25e3333db573b70ca342d5d040800d030c3e8348983a2592de415297b0b5b3b

242 Risk Score

Malware Insights

Xls.Malware.Valyria-10036093-0 · confidence 95%

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains multiple embedded OLE objects, with \objupdate directives indicating an attempt to automatically activate them. High heuristic scores for excessive hex data within these objects suggest they are used to hide a malicious payload. ClamAV detection confirms this, identifying the sample as Xls.Malware.Valyria-10036093-0, which likely exploits a vulnerability to execute code.

Heuristics 6

ClamAV: Doc.Dropper.Agent-6940944-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-6940944-0
\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 ~1037KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 14 \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 14

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002c45.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2C45	27195 bytes
SHA-256: `8f77caad7536aaf7c794c61be64730f488a4bb7527872f871c1858eb1df2a02a`
Detection ClamAV: Doc.Dropper.Agent-6940944-0 Obfuscation or payload: unlikely
`objdata_01_off00016074.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x16074	27195 bytes
SHA-256: `3462ac8f1d152b5d2abcba3120ade63c6c7df763e772ae7a749fc59076f915de`
Detection ClamAV: Doc.Dropper.Agent-6940944-0 Obfuscation or payload: unlikely
`objdata_02_off000294a3.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x294A3	27195 bytes
SHA-256: `c5d43ccc85eb901efaff9f947283ef97697785d021759415af5220588c57399d`
Detection ClamAV: Doc.Dropper.Agent-6940944-0 Obfuscation or payload: unlikely
`objdata_03_off0003c8d2.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3C8D2	27195 bytes
SHA-256: `4a555788a751e536ee7f324baae5e09b169c8b5c76f8a7871ab870eac2b3c175`
Detection ClamAV: Doc.Dropper.Agent-6940944-0 Obfuscation or payload: unlikely
`objdata_04_off0004fd01.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x4FD01	27195 bytes
SHA-256: `42cc3ef0eaa4fca7df3cc2202073e79d1d52c230a700a0126e96564b37a640ee`
Detection ClamAV: Doc.Dropper.Agent-6940944-0 Obfuscation or payload: unlikely
`objdata_05_off00063130.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x63130	27195 bytes
SHA-256: `560e8ef1b1bf31659f2c1006b9fba1b5e9d6d56e4bd065cec167ee59b8f62f1f`
Detection ClamAV: Doc.Dropper.Agent-6940944-0 Obfuscation or payload: unlikely
`objdata_06_off0007655f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x7655F	27195 bytes
SHA-256: `90d9a1b4fe1f99c11aec3fe4defef7aaeaab067bd808f4808936a3d3d5c90f09`
Detection ClamAV: Doc.Dropper.Agent-6940944-0 Obfuscation or payload: unlikely
`objdata_07_off000899da.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x899DA	27195 bytes
SHA-256: `2c5b7c593cf5a0e5afee5a289ce386a37a3ff5bfbb0d9b4b08f098224c868d27`
Detection ClamAV: Doc.Dropper.Agent-6940944-0 Obfuscation or payload: unlikely
`objdata_08_off0009ce09.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x9CE09	27195 bytes
SHA-256: `5e1f7423e07c2b8d120782e066b8602b9775126090d1342b75f523fa1a610ab0`
Detection ClamAV: Doc.Dropper.Agent-6940944-0 Obfuscation or payload: unlikely
`objdata_09_off000b0238.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xB0238	27195 bytes
SHA-256: `e8341172c9d1927e4e61a0379ae1ecd4f87f6b91702797b4f81c46f44c066169`
Detection ClamAV: Doc.Dropper.Agent-6940944-0 Obfuscation or payload: unlikely
`objdata_10_off000c3667.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xC3667	27195 bytes
SHA-256: `a409cefb70af7eb25ccf6c3efb2519b573a5098ecca6404c58273cb13884f867`
Detection ClamAV: Doc.Dropper.Agent-6940944-0 Obfuscation or payload: unlikely
`objdata_11_off000d6a96.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xD6A96	27195 bytes
SHA-256: `76cd5e94a142c80068d87025e2e62e76080ccf91f71c9c4bfdbed9266a3524ae`
Detection ClamAV: Doc.Dropper.Agent-6940944-0 Obfuscation or payload: unlikely
`objdata_12_off000e9ec5.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xE9EC5	27195 bytes
SHA-256: `e67355db11c94033dfad501995b61a5e8cd714ceb516971cd248a220d48dac5a`
Detection ClamAV: Doc.Dropper.Agent-6940944-0 Obfuscation or payload: unlikely
`objdata_13_off000fd2f4.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xFD2F4	27195 bytes
SHA-256: `3641520e5797e823ec6f6c88933c4034fa3473f9c5e9ccc122ca3a2ddc6051bf`
Detection ClamAV: Doc.Dropper.Agent-6940944-0 Obfuscation or payload: unlikely

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