Xls.Malware.Sload-7135989-0 RTF malware analysis — malicious · 8d394f62830cb12e

MALICIOUS

RTF

1.06 MB Created: 2018-07-13 13:18:00 First seen: 2019-06-27

MD5: d52f70e76afe8cae8b8d8b83a2f36415 SHA-1: 66b9b2025548ced39b2ee6814f03fc601db4d4c3 SHA-256: 8d394f62830cb12e0e0577fd8b4a3620fb3d8d2744b2a6789da99c49892b2920

282 Risk Score

Malware Insights

Xls.Malware.Sload-7135989-0 · confidence 95%

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information

The RTF file exhibits multiple high-severity heuristics related to embedded OLE objects and excessive hex-encoded data, strongly indicating a malicious intent to hide and execute a payload. ClamAV detection confirms this, identifying the file as Xls.Malware.Sload-7135989-0. The presence of ".objupdate" forces OLE activation, likely triggering the embedded malicious content.

Heuristics 7

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.Sload-7135989-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Sload-7135989-0
\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 ~1027KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 15 \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 15

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00003c9b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3C9B	24635 bytes
SHA-256: `d92825d9c65e7a9308658f93cd30b8ac4d2c0beffe8f322020fa446ef92ea213`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_01_off000154e4.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x154E4	24635 bytes
SHA-256: `b7ce3540b1c654776b61019800c39085ab9e5d1ce797430d7a36dd1f0db98d35`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_02_off00026d2d.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x26D2D	24635 bytes
SHA-256: `53c5170a1f9d5da54a5b4512271e98cc4867248432b583c8b3e230daf72f3a42`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_03_off00038576.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x38576	24635 bytes
SHA-256: `e6b6a3bc898317b3df25f8506416366e83ef8af6abae40ee2ec3f45dd0ba591d`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_04_off00049dbf.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x49DBF	24635 bytes
SHA-256: `e5e5674d1b47c4cfc3847825c9a0e8674544a28ad3ff45c1cc59635e34be60ad`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_05_off0005c418.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x5C418	24635 bytes
SHA-256: `035dcc81fb5b1aa4c98de470e5f23cea6da2099d9ea8f195ee6c736ea86b0729`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_06_off0006db71.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x6DB71	24635 bytes
SHA-256: `f4eca59d80dfb58ca01d9452530bd1570d8c504a777fcdfc9c3b09b8b7e1fe7c`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_07_off0007f3da.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x7F3DA	24635 bytes
SHA-256: `55b92bb86375ba5d8e7c09785b3b118ddcb526fc9c2c18446824a17c9ecc811d`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_08_off00090c43.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x90C43	24635 bytes
SHA-256: `adea57addf1933a97a92b63f1974be5d9ad1cf9900d45243fe699e2044dbb52f`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_09_off000a24ac.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xA24AC	24635 bytes
SHA-256: `7d03e75a4faac372bf4a770d8bb7ed0677845f28291abcce898d77af06fff2f6`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_10_off000b3d15.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xB3D15	24635 bytes
SHA-256: `2c8e1f073a11efca801066c771283feb63efef9236e1f475c2b3399e61491dd2`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_11_off000c5602.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xC5602	24635 bytes
SHA-256: `b9dc1d79fefd88927076d383911f027031d13d944f60dcca8f940238ff417c39`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_12_off000d6e6b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xD6E6B	24635 bytes
SHA-256: `71a95f897b3ee1af3876174956493587fe5ee7829bb9ad1b1c130ac2c440a52f`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_13_off000e86d4.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xE86D4	24635 bytes
SHA-256: `758b91f02a28ec5ab506d026ff2e1ee63bb23e58e60994921923a2726351e86a`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely
`objdata_14_off000f9f3d.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xF9F3D	24635 bytes
SHA-256: `cc23e9e45d8017ef85125205b8c5b296410e7e3203e0c238187227f7dd3074b5`
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: unlikely

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