tofsee | e6eba455a3dec3f3b4f52ec852f0335b4955b6508d9d6d6b90e9c21ab293cf0a

General

Target

file.exe
Size

202KB
MD5

9388dbeb6fdf9003fbc7ca159cfda275
SHA1

ff1d836222240de90ad3d75a279d9cc565869590
SHA256

e6eba455a3dec3f3b4f52ec852f0335b4955b6508d9d6d6b90e9c21ab293cf0a
SHA512

98ece8a30b01c71aacd64b9e3b0d5ffe92f5a13b4a73365dabba36be4acf11f331ee424a09b05c48279a810a77e9aff05440c201072082004b68bcdba3dea4c1
SSDEEP

3072:pRcFAhzF4JmYYa2Nurb9jNbpDp6JUmu5BkIs/Vr:MA/AZD3LrFmzI2V

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

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 1 TTPs 1 IoCs

evasion

Windows Service

T1543.003

pid	Process
1740	netsh.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-1-5-21-1141987721-3945596982-3297311814-1000\Control Panel\International\Geo\Nation	file.exe

Executes dropped EXE 1 IoCs

pid	Process
5048	igvdwmhd.exe

Launches sc.exe 3 IoCs

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

pid	Process
8	sc.exe
2116	sc.exe
1784	sc.exe

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

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3792	2656	WerFault.exe	81

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 2656 wrote to memory of 1684	2656	file.exe	100
PID 2656 wrote to memory of 1684	2656	file.exe	100
PID 2656 wrote to memory of 1684	2656	file.exe	100
PID 2656 wrote to memory of 4700	2656	file.exe	103
PID 2656 wrote to memory of 4700	2656	file.exe	103
PID 2656 wrote to memory of 4700	2656	file.exe	103
PID 2656 wrote to memory of 8	2656	file.exe	105
PID 2656 wrote to memory of 8	2656	file.exe	105
PID 2656 wrote to memory of 8	2656	file.exe	105
PID 2656 wrote to memory of 2116	2656	file.exe	107
PID 2656 wrote to memory of 2116	2656	file.exe	107
PID 2656 wrote to memory of 2116	2656	file.exe	107
PID 2656 wrote to memory of 1784	2656	file.exe	108
PID 2656 wrote to memory of 1784	2656	file.exe	108
PID 2656 wrote to memory of 1784	2656	file.exe	108
PID 2656 wrote to memory of 1740	2656	file.exe	113
PID 2656 wrote to memory of 1740	2656	file.exe	113
PID 2656 wrote to memory of 1740	2656	file.exe	113

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2656
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ydxmlgux\
  2⤵
  PID:1684
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\igvdwmhd.exe" C:\Windows\SysWOW64\ydxmlgux\
  2⤵
  PID:4700
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create ydxmlgux binPath= "C:\Windows\SysWOW64\ydxmlgux\igvdwmhd.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:8
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description ydxmlgux "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2116
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start ydxmlgux
  2⤵
  - Launches sc.exe
  PID:1784
- 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:1740
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2656 -s 1028
  2⤵
  - Program crash
  PID:3792

C:\Windows\SysWOW64\ydxmlgux\igvdwmhd.exe
C:\Windows\SysWOW64\ydxmlgux\igvdwmhd.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
PID:5048

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 2656 -ip 2656
1⤵
PID:628

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Create or Modify System Process

2

T1543

Windows Service

2

T1543.003

Privilege Escalation

Create or Modify System Process

2

T1543

Windows Service

2

T1543.003

Defense Evasion

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\igvdwmhd.exe

Filesize
10.2MB

MD5
66be56d319a762423d3202e3c8143716

SHA1
92f6075c51633f2e6aebdfb0a13ecf992596ed15

SHA256
ba428b88ff6416acf441b83c9971c8743a35b3e93e71509562fdb0667b2b145b

SHA512
5fdd9bf44556b1b21f5366848ad8b05732a6c64b6566fa3f3916274c57641567d8c8a5ca61b79a485036b5dbf31ea1a28b01b0c9910a7e2cf4fd129c23901a05

Download Submit
C:\Windows\SysWOW64\ydxmlgux\igvdwmhd.exe

Filesize
10.2MB

MD5
66be56d319a762423d3202e3c8143716

SHA1
92f6075c51633f2e6aebdfb0a13ecf992596ed15

SHA256
ba428b88ff6416acf441b83c9971c8743a35b3e93e71509562fdb0667b2b145b

SHA512
5fdd9bf44556b1b21f5366848ad8b05732a6c64b6566fa3f3916274c57641567d8c8a5ca61b79a485036b5dbf31ea1a28b01b0c9910a7e2cf4fd129c23901a05

Download Submit
memory/2656-1-0x0000000000780000-0x0000000000880000-memory.dmp

Filesize
1024KB

Download
memory/2656-2-0x00000000001C0000-0x00000000001D3000-memory.dmp

Filesize
76KB

Download
memory/2656-3-0x0000000000400000-0x00000000005A9000-memory.dmp

Filesize
1.7MB

Download
memory/2656-5-0x0000000000400000-0x00000000005A9000-memory.dmp

Filesize
1.7MB

Download
memory/2656-9-0x0000000000400000-0x00000000005A9000-memory.dmp

Filesize
1.7MB

Download
memory/2656-10-0x00000000001C0000-0x00000000001D3000-memory.dmp

Filesize
76KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads