YoungLotus

Yara sig:

rule Younglotus_bin
{
    meta:
        description = "YoungLotus"
        author = "James_inthe_box"
        reference = "903c4fad643ecfab5c523dfb4b555693071717e8e5fb508338dde71e28d0b676"
        date = "2019/02"
        maltype = "RAT"

    strings:
        $string1 = "icon=%%WinDir%%\\system32\\shell32.dll"
        $string2 = "For i = 1 To Len(WriteData) Step 2"
        $string3 = "complete.dat"
        $string4 = ":///:GET /%s HTTP/1.1"

    condition:
        uint16(0) == 0x5A4D and all of ($string*) and filesize < 100KB
}


rule Younglotus_mem
{
    meta:
        description = "YoungLotus"
        author = "James_inthe_box"
        reference = "903c4fad643ecfab5c523dfb4b555693071717e8e5fb508338dde71e28d0b676"
        date = "2019/02"
        maltype = "RAT"

    strings:
        $string1 = "icon=%%WinDir%%\\system32\\shell32.dll"
        $string2 = "For i = 1 To Len(WriteData) Step 2"
        $string3 = "complete.dat"
        $string4 = ":///:GET /%s HTTP/1.1"

    condition:
        all of ($string*) and filesize > 100KB
}