tofsee | 7cfc0cb1634d36afcbb33d202d956c030d5d0cc15113eb7c64d3429c50fb1a22

General

Target

77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe
Size

276KB
MD5

80ee506064ae22c8ea34ffb2431f2488
SHA1

0c5a71beb97751a781203d598e97e5a746df62df
SHA256

77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb
SHA512

39be470cc5e8f170296371c7cfb7727b402e4c8b6e1ea6d66fe4195aa83f090cb9cf17d941dbb15214ae9e0a20f0015a190eb35a563067f2d645ea3f21609a6c
SSDEEP

3072:/3czQeDsw9vCdirSqJ4GGueYDDwOtDUeblv8zMrnwg5o6JP3WJ0nWFok:GQmstdiDJ4xuHDwiDpd8z+w56J+Dak

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

New Service
T1050

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
3356	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\tfdmsxeo\ImagePath = "C:\\Windows\\SysWOW64\\tfdmsxeo\\ipwzocvf.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-1-5-21-144354903-2550862337-1367551827-1000\Control Panel\International\Geo\Nation	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe

Executes dropped EXE 1 IoCs

pid	Process
4684	ipwzocvf.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\config\systemprofile:.repos	svchost.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4684 set thread context of 1712	4684	ipwzocvf.exe	99

Launches sc.exe 3 IoCs

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

pid	Process
232	sc.exe
1844	sc.exe
2312	sc.exe

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

System Information Discovery
T1082

Program crash 2 IoCs

pid	pid_target	Process	procid_target
3456	2196	WerFault.exe	83
1816	4684	WerFault.exe	94

Modifies data under HKEY_USERS 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT\Control Panel\Buses	svchost.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Control Panel\Buses\Config0 = d4bd773c8e50270124edb47d450dd49d084297dce82e72baa4c0048acc92121d0b3cb9ae80cd945d24edb47d470dd49d024195daf71261adc06d04fda6e22673bbc9154961cda56811d8864a713ce0af644490bdb67d23e9925d03c9f2ba54758df21d5904e0a66d14d4824e7739e5ae64419bdce0286682cd0934c9c4e4241dd59e420b36fca06413edc70f3252a0f40948f48cb17522e9975e05cbfc8d387287cc186270a4f93824dc8148713fe3a85519c2bd606da4dd2ef087a1c48d541de5ad743d73a2e6367b9ec60b440dd49d642df4bdf3279dcbe16d34fdc48e980fe7ad743d05f5a47312db9a4a7123e6a8502df4bd844d14dda46d34fdc48d541de4ad743d04cd945d24edb47d440dd49d642df4bd844d14dda46d34fdc48d541de4ad743d042e955d24	svchost.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 2196 wrote to memory of 1508	2196	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	84
PID 2196 wrote to memory of 1508	2196	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	84
PID 2196 wrote to memory of 1508	2196	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	84
PID 2196 wrote to memory of 1736	2196	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	86
PID 2196 wrote to memory of 1736	2196	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	86
PID 2196 wrote to memory of 1736	2196	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	86
PID 2196 wrote to memory of 1844	2196	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	88
PID 2196 wrote to memory of 1844	2196	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	88
PID 2196 wrote to memory of 1844	2196	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	88
PID 2196 wrote to memory of 2312	2196	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	90
PID 2196 wrote to memory of 2312	2196	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	90
PID 2196 wrote to memory of 2312	2196	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	90
PID 2196 wrote to memory of 232	2196	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	92
PID 2196 wrote to memory of 232	2196	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	92
PID 2196 wrote to memory of 232	2196	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	92
PID 2196 wrote to memory of 3356	2196	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	95
PID 2196 wrote to memory of 3356	2196	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	95
PID 2196 wrote to memory of 3356	2196	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	95
PID 4684 wrote to memory of 1712	4684	ipwzocvf.exe	99
PID 4684 wrote to memory of 1712	4684	ipwzocvf.exe	99
PID 4684 wrote to memory of 1712	4684	ipwzocvf.exe	99
PID 4684 wrote to memory of 1712	4684	ipwzocvf.exe	99
PID 4684 wrote to memory of 1712	4684	ipwzocvf.exe	99

C:\Users\Admin\AppData\Local\Temp\77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe
"C:\Users\Admin\AppData\Local\Temp\77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2196
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\tfdmsxeo\
  2⤵
  PID:1508
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ipwzocvf.exe" C:\Windows\SysWOW64\tfdmsxeo\
  2⤵
  PID:1736
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create tfdmsxeo binPath= "C:\Windows\SysWOW64\tfdmsxeo\ipwzocvf.exe /d\"C:\Users\Admin\AppData\Local\Temp\77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:1844
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description tfdmsxeo "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2312
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start tfdmsxeo
  2⤵
  - Launches sc.exe
  PID:232
- 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:3356
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2196 -s 1032
  2⤵
  - Program crash
  PID:3456

C:\Windows\SysWOW64\tfdmsxeo\ipwzocvf.exe
C:\Windows\SysWOW64\tfdmsxeo\ipwzocvf.exe /d"C:\Users\Admin\AppData\Local\Temp\77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4684
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Drops file in System32 directory
  - Modifies data under HKEY_USERS
  PID:1712
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4684 -s 556
  2⤵
  - Program crash
  PID:1816

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 2196 -ip 2196
1⤵
PID:1724

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 548 -p 4684 -ip 4684
1⤵
PID:4272

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

New Service

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

New Service

1

T1050

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
13.5MB

MD5
e9cb71266803e7b0d0d2d29621a4cf78

SHA1
b7c855e27705411658105e25e2a25c23184824dd

SHA256
d70ee721a3f4ef663e7a95385fe7a10919d751b5110675c98bf847d7724e449d

SHA512
0efb9de0821005f264752de64170fa30669699e46da62ffa4227b7d5e6bc3e41cfe3f2c4d297dffdcd93b7ca55c0b4846d0c8bbe920a788fa39259e946045b10

Download Submit
C:\Windows\SysWOW64\tfdmsxeo\ipwzocvf.exe

Filesize
13.5MB

MD5
e9cb71266803e7b0d0d2d29621a4cf78

SHA1
b7c855e27705411658105e25e2a25c23184824dd

SHA256
d70ee721a3f4ef663e7a95385fe7a10919d751b5110675c98bf847d7724e449d

SHA512
0efb9de0821005f264752de64170fa30669699e46da62ffa4227b7d5e6bc3e41cfe3f2c4d297dffdcd93b7ca55c0b4846d0c8bbe920a788fa39259e946045b10

Download Submit
memory/1712-141-0x0000000000AF0000-0x0000000000B05000-memory.dmp

Filesize
84KB

Download
memory/1712-145-0x0000000000AF0000-0x0000000000B05000-memory.dmp

Filesize
84KB

Download
memory/1712-146-0x0000000000AF0000-0x0000000000B05000-memory.dmp

Filesize
84KB

Download
memory/1712-148-0x0000000000AF0000-0x0000000000B05000-memory.dmp

Filesize
84KB

Download
memory/1712-150-0x0000000000AF0000-0x0000000000B05000-memory.dmp

Filesize
84KB

Download
memory/2196-135-0x0000000000600000-0x0000000000613000-memory.dmp

Filesize
76KB

Download
memory/2196-140-0x0000000000400000-0x00000000004B3000-memory.dmp

Filesize
716KB

Download
memory/4684-147-0x0000000000400000-0x00000000004B3000-memory.dmp

Filesize
716KB

Download

Analysis

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