TrojanDropper:Win32/Ilomo.D

TrojanDropper:Win32/Ilomo.D is a trojan that drops another malware, detected as Trojan:Win32/Ilomo.C, in the system.

Drops other malware

Upon execution, TrojanDropper:Win32/Ilomo.D drops Trojan:Win32/Ilomo.C into the %APPDATA% folder as one of the following file names:

 

dumpreport.exe
msiexeca.exe
svchosts.exe
upnpsvc.exe
service.exe
taskmon.exe
rundll.exe
helper.exe
event.exe
logon.exe
sound.exe
lsas.exe

 

Note that these file names are similar to the file names used by legitimate system processes (such as 'lsass.exe', 'svchost.exe', and 'services.exe').

 

It also modifies the system registry so that its dropped malware automatically runs every time Windows starts:

 

Adds value: "<value>"
With data: "%APPDATA%\<malware name>"
To subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run

 

where <malware name> is one of the above possible file names and <value> is one of the following:

 

CrashDump
svchosts
EventLog
TaskMon
Windows
RunDll
System
Setup
Sound
lsass
UPNP
Init

 

It then runs its dropped malware, Trojan:Win32/Ilomo.C.

 

TrojanDropper:Win32/Ilomo.D also creates the following registry entries:

Adds value: "GID"

With data: "hex:00,00,02,10,"

Adds value: "KeyM"

With data: "hex:94,6b,ee,bc,ff,a5,bb,8b,5e,68,2a,a5,8f,bf,24,f5,7a,63,b7,9c,bb,db,14,d5,1f,ae,b0,57,34,02,59,6f,c6,38,9c,7e,bd,8f,82,02,9f,36,ab,3f,0c,6c,b9,4c,c3,98,7e,e6,77,0a,cc,53,20,6f,6b,5b,ec,83,a8,9e,34,c1,9e,9c,73,93,05,01,f3,3d,d2,da,79,ed,63,00,04,25,cb,82,fc,87,3d,89,e1,86,79,79,8c,67,a8,43,5c,bc,65,26,66,5e,b1,8a,c5,51,95,e0,24,b8,7f,f5,1a,1c,20,83,dd,b7,44,e6,e7,66,b3,5d,88,a7,85,c8,2b,a4,58,4e,18,85,a2,9d,d3,16,d5,89,e6,51,4b,70,90,c9,f3,82,69,13,f1,09,ed,7c,30,86,2a,16,4a,4c,a4,06,fa,f9,78,c4,7d,72,93,fc,64,d7,48,c5,fb,83,a2,44,0a,98,77,be,cd,4b,fe,a8,69,a2,16,f2,73,c5,f1,44,ff,11,38,3e,af,5f,3f,87,05,61,61,fc,ff,22,be,00,d5,46,67,a0,ba,ce,65,a5,c7,32,03,93,11,96,62,7e,eb,0b,5d,9d,9a,92,1b,41,10,8c,2c,9b,09,a5,11,84,eb,91,ca,34,18,0e,92,2d,85,c7,6b,02,b0,ef,"

Adds value: "KeyE"

With data: "hex:00,01,00,01,"

Adds value: "GatesList"

With data: "hex:74,72,79,2e,6d,6f,6a,69,74,6f,62,6f,6f,6d,2e,69,6e,00,2f,55,34,4c,36,4e,51,4c,4d,4d,71,4f,46,74,64,39,34,00,64,69,72,65,63,74,2e,6d,61,74,63,68,62,6f,78,2e,76,63,00,2f,4c,4e,4c,42,42,61,57,4a,6e,64,64,6b,38,76,50,76,00,"

To subkey: HKCU\Software\Microsoft\Internet Explorer\Settings

 

The data for value 'GatesList' translates as:

 

 

The above data contains Web sites to which Trojan:Win32/Ilomo.C attempts to connect to.

For more information about Trojan:Win32/Ilomo.C, see our description elsewhere in the encyclopedia.

 

Analysis by Dan Kurc