tofsee | bf377f3b66ceadcfa6d4da5f23ee0695063d00da714e6c6b78eae717b8d72b68

General

Target

edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe
Size

13.8MB
MD5

edceb005c2a4dbdbd26fbf126afa558e
SHA1

2aca159eb26d1a8dd90392866c8cb340ea256969
SHA256

bf377f3b66ceadcfa6d4da5f23ee0695063d00da714e6c6b78eae717b8d72b68
SHA512

fff9c42708f303774083cd72b0a9bf4d0a62c0bbd10c80e18f21858e129802f651ed69e6e63d903e286c6521d5e1af9ebf123255fe687b0a0e37ecadb87c0726
SSDEEP

49152:l1yvllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll:lA

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

43.231.4.7

lazystax.ru

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Creates new service(s) 1 TTPs
persistence

Windows Service
T1543.003

Modifies Windows Firewall 2 TTPs 1 IoCs

evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
688	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\rexjlnso\ImagePath = "C:\\Windows\\SysWOW64\\rexjlnso\\gxfdnipd.exe"	svchost.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-609813121-2907144057-1731107329-1000\Control Panel\International\Geo\Nation	edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe

Deletes itself 1 IoCs

pid	Process
3012	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
864	gxfdnipd.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 864 set thread context of 3012	864	gxfdnipd.exe	101

Launches sc.exe 3 IoCs

Sc.exe is a Windows utlilty to control services on the system.

pid	Process
4480	sc.exe
3184	sc.exe
4820	sc.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Program crash 2 IoCs

pid	pid_target	Process	procid_target
1856	5076	WerFault.exe	82
1516	864	WerFault.exe	96

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 5076 wrote to memory of 4904	5076	edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe	83
PID 5076 wrote to memory of 4904	5076	edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe	83
PID 5076 wrote to memory of 4904	5076	edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe	83
PID 5076 wrote to memory of 3952	5076	edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe	85
PID 5076 wrote to memory of 3952	5076	edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe	85
PID 5076 wrote to memory of 3952	5076	edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe	85
PID 5076 wrote to memory of 4480	5076	edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe	87
PID 5076 wrote to memory of 4480	5076	edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe	87
PID 5076 wrote to memory of 4480	5076	edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe	87
PID 5076 wrote to memory of 3184	5076	edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe	89
PID 5076 wrote to memory of 3184	5076	edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe	89
PID 5076 wrote to memory of 3184	5076	edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe	89
PID 5076 wrote to memory of 4820	5076	edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe	91
PID 5076 wrote to memory of 4820	5076	edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe	91
PID 5076 wrote to memory of 4820	5076	edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe	91
PID 5076 wrote to memory of 688	5076	edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe	93
PID 5076 wrote to memory of 688	5076	edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe	93
PID 5076 wrote to memory of 688	5076	edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe	93
PID 864 wrote to memory of 3012	864	gxfdnipd.exe	101
PID 864 wrote to memory of 3012	864	gxfdnipd.exe	101
PID 864 wrote to memory of 3012	864	gxfdnipd.exe	101
PID 864 wrote to memory of 3012	864	gxfdnipd.exe	101
PID 864 wrote to memory of 3012	864	gxfdnipd.exe	101

C:\Users\Admin\AppData\Local\Temp\edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:5076
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rexjlnso\
  2⤵
  PID:4904
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gxfdnipd.exe" C:\Windows\SysWOW64\rexjlnso\
  2⤵
  PID:3952
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create rexjlnso binPath= "C:\Windows\SysWOW64\rexjlnso\gxfdnipd.exe /d\"C:\Users\Admin\AppData\Local\Temp\edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:4480
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description rexjlnso "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:3184
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start rexjlnso
  2⤵
  - Launches sc.exe
  PID:4820
- C:\Windows\SysWOW64\netsh.exe
  "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
  2⤵
  - Modifies Windows Firewall
  PID:688
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 5076 -s 1040
  2⤵
  - Program crash
  PID:1856

C:\Windows\SysWOW64\rexjlnso\gxfdnipd.exe
C:\Windows\SysWOW64\rexjlnso\gxfdnipd.exe /d"C:\Users\Admin\AppData\Local\Temp\edceb005c2a4dbdbd26fbf126afa558e_JaffaCakes118.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:864
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:3012
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 864 -s 508
  2⤵
  - Program crash
  PID:1516

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 5076 -ip 5076
1⤵
PID:4648

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 864 -ip 864
1⤵
PID:4724

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

2

T1543

Windows Service

2

T1543.003

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

2

T1543

Windows Service

2

T1543.003

Defense Evasion

Impair Defenses

1

T1562

Disable or Modify System Firewall

Modify Registry

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\gxfdnipd.exe

Filesize
11.7MB

MD5
ff4ffd3a6db60cbb6f5dc1e8064da758

SHA1
4c8ca7ad37af6d7f132b824d85baf7fb76a016ef

SHA256
691c1cfaed8af2bbb1e80dfc3b55935f4919b623602d3db8511a596ebcd53658

SHA512
48887b6c02b256d4acc0c687b6411cc97a56bd72a18462a395f76890e2f14c866fd7df73bb1f6f09d35753b8c91802398da1e44057285e421d19ad1667ac0db6

Download Submit
memory/864-10-0x0000000000DE0000-0x0000000000EE0000-memory.dmp

Filesize
1024KB

Download
memory/864-11-0x0000000000400000-0x0000000000C20000-memory.dmp

Filesize
8.1MB

Download
memory/864-18-0x0000000000400000-0x0000000000C20000-memory.dmp

Filesize
8.1MB

Download
memory/3012-12-0x00000000001E0000-0x00000000001F5000-memory.dmp

Filesize
84KB

Download
memory/3012-15-0x00000000001E0000-0x00000000001F5000-memory.dmp

Filesize
84KB

Download
memory/3012-16-0x00000000001E0000-0x00000000001F5000-memory.dmp

Filesize
84KB

Download
memory/3012-17-0x00000000001E0000-0x00000000001F5000-memory.dmp

Filesize
84KB

Download
memory/3012-19-0x00000000001E0000-0x00000000001F5000-memory.dmp

Filesize
84KB

Download
memory/5076-4-0x0000000000400000-0x0000000000C20000-memory.dmp

Filesize
8.1MB

Download
memory/5076-2-0x0000000002820000-0x0000000002833000-memory.dmp

Filesize
76KB

Download
memory/5076-7-0x0000000000400000-0x0000000000C20000-memory.dmp

Filesize
8.1MB

Download
memory/5076-8-0x0000000002820000-0x0000000002833000-memory.dmp

Filesize
76KB

Download
memory/5076-1-0x0000000000D60000-0x0000000000E60000-memory.dmp

Filesize
1024KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads