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Permanent link Tool: Gelup

NamesGelup
CategoryMalware
TypeDownloader
Description(Trend Micro) In the same June 20 campaign, we also found another apparently new, undisclosed malware, which we named “Gelup”. A custom packer was also used to pack some variants of this malware. Again, it uses the same packer that TA505 has been using.

The unpacked payload is written in C++ and basically works as a downloader for another malware. What makes Gelup different, however, is its obfuscation technique and UAC-bypassing function bymocking trusted directories (spoofing the file’s execution path in a trusted directory), abusing auto-elevated executables, and using the dynamic-link library (DLL) side-loading technique.

First, Gelup resolves most Windows application programming interfaces (APIs) by using the hash just before calling it —a common technique used by a lot of malware families. Second, the strings in Gelup’s code are decrypted at runtime.
Information<https://documents.trendmicro.com/assets/Tech-Brief-Latest-Spam-Campaigns-from-TA505-Now-Using-New-Malware-Tools-Gelup-and-FlowerPippi.pdf>
AlienVault OTX<https://otx.alienvault.com/browse/pulses?q=tag:Gelup>

Last change to this tool card: 20 April 2020

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All groups using tool Gelup

ChangedNameCountryObserved

APT groups

XTA505, Graceful Spider, Gold EvergreenRussia2006-Oct 2020 HOTX

1 group listed (1 APT, 0 other, 0 unknown)

Thailand Computer Emergency Response Team (ThaiCERT)
Electronic Transactions Development Agency

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