tofsee | e8ee109e27398ee0a3db27958f243924c1bba9523919c375a49e606acc53cc54

General

Target

file.exe
Size

147KB
MD5

4eb62a4c6ef0b767b031754502a53d39
SHA1

1031001a9972fadf5308ade23eaa3010a168c256
SHA256

e8ee109e27398ee0a3db27958f243924c1bba9523919c375a49e606acc53cc54
SHA512

d5765daac7a19123e203e0f7e90c2ed43e6aebb1246c5516b7141f526a007a3d06310e278ebf2e0dece2e0a0446a602fea22a537d4caa6f79aa2625e23859047
SSDEEP

3072:YrEIFtEGVCjl65U0o000FBUFfmEeVdvw46LkxC:HZGVy0o000FBUYnvwL

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

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
Executes dropped EXE 1 IoCs

Processes:

nkefckah.exe

pid process

3652 nkefckah.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1964 netsh.exe

pid	process
3652	nkefckah.exe

pid	process
1964	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\wkdjfwfl\ImagePath = "C:\\Windows\\SysWOW64\\wkdjfwfl\\nkefckah.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

Processes:

file.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation file.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

nkefckah.exe

description pid process target process

PID 3652 set thread context of 2116 3652 nkefckah.exe svchost.exe
Launches sc.exe 3 IoCs
Sc.exe is a Windows utlilty to control services on the system.

Processes:

sc.exesc.exesc.exe

pid process

220 sc.exe
1800 sc.exe
684 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

Processes:

WerFault.exeWerFault.exe

pid pid_target process target process

2264 4200 WerFault.exe file.exe
3656 3652 WerFault.exe nkefckah.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation	file.exe

description	pid	process	target process
PID 3652 set thread context of 2116	3652	nkefckah.exe	svchost.exe

pid	process
220	sc.exe
1800	sc.exe
684	sc.exe

pid	pid_target	process	target process
2264	4200	WerFault.exe	file.exe
3656	3652	WerFault.exe	nkefckah.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

file.exenkefckah.exe

description	pid	process	target process
PID 4200 wrote to memory of 64	4200	file.exe	cmd.exe
PID 4200 wrote to memory of 64	4200	file.exe	cmd.exe
PID 4200 wrote to memory of 64	4200	file.exe	cmd.exe
PID 4200 wrote to memory of 2864	4200	file.exe	cmd.exe
PID 4200 wrote to memory of 2864	4200	file.exe	cmd.exe
PID 4200 wrote to memory of 2864	4200	file.exe	cmd.exe
PID 4200 wrote to memory of 220	4200	file.exe	sc.exe
PID 4200 wrote to memory of 220	4200	file.exe	sc.exe
PID 4200 wrote to memory of 220	4200	file.exe	sc.exe
PID 4200 wrote to memory of 1800	4200	file.exe	sc.exe
PID 4200 wrote to memory of 1800	4200	file.exe	sc.exe
PID 4200 wrote to memory of 1800	4200	file.exe	sc.exe
PID 4200 wrote to memory of 684	4200	file.exe	sc.exe
PID 4200 wrote to memory of 684	4200	file.exe	sc.exe
PID 4200 wrote to memory of 684	4200	file.exe	sc.exe
PID 4200 wrote to memory of 1964	4200	file.exe	netsh.exe
PID 4200 wrote to memory of 1964	4200	file.exe	netsh.exe
PID 4200 wrote to memory of 1964	4200	file.exe	netsh.exe
PID 3652 wrote to memory of 2116	3652	nkefckah.exe	svchost.exe
PID 3652 wrote to memory of 2116	3652	nkefckah.exe	svchost.exe
PID 3652 wrote to memory of 2116	3652	nkefckah.exe	svchost.exe
PID 3652 wrote to memory of 2116	3652	nkefckah.exe	svchost.exe
PID 3652 wrote to memory of 2116	3652	nkefckah.exe	svchost.exe

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:4200

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wkdjfwfl\
2⤵
PID:64

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\nkefckah.exe" C:\Windows\SysWOW64\wkdjfwfl\
2⤵
PID:2864

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create wkdjfwfl binPath= "C:\Windows\SysWOW64\wkdjfwfl\nkefckah.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:220

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description wkdjfwfl "wifi internet conection"
2⤵
- Launches sc.exe
PID:1800

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start wkdjfwfl
2⤵
- Launches sc.exe
PID:684

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:1964

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4200 -s 676
2⤵
- Program crash
PID:2264

C:\Windows\SysWOW64\wkdjfwfl\nkefckah.exe
C:\Windows\SysWOW64\wkdjfwfl\nkefckah.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3652

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:2116

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 3652 -s 516
2⤵
- Program crash
PID:3656

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 4200 -ip 4200
1⤵
PID:2908

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 552 -p 3652 -ip 3652
1⤵
PID:3440

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

New Service

1

T1050

Modify Existing Service

1

T1031

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

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\nkefckah.exe
Filesize
11.3MB

MD5
c2594377a665439cc2a005c055d02d0e

SHA1
aea7c41de2b35d14a6c23703d1c51277ccfa700f

SHA256
659a445217756934707ccffe5126bff2562acc5638189ee132caf04708dec065

SHA512
f9a9d95abdaa0f3dbe1e19983bd23eb2ddc05fea01383b1e87f299400d18dbc5c836b8195d4155858a297d06999aabf0a633b5be39f377a64d436855c9e6004c

Download Submit
C:\Windows\SysWOW64\wkdjfwfl\nkefckah.exe
Filesize
11.3MB

MD5
c2594377a665439cc2a005c055d02d0e

SHA1
aea7c41de2b35d14a6c23703d1c51277ccfa700f

SHA256
659a445217756934707ccffe5126bff2562acc5638189ee132caf04708dec065

SHA512
f9a9d95abdaa0f3dbe1e19983bd23eb2ddc05fea01383b1e87f299400d18dbc5c836b8195d4155858a297d06999aabf0a633b5be39f377a64d436855c9e6004c

Download Submit
memory/64-135-0x0000000000000000-mapping.dmp

Download
memory/220-138-0x0000000000000000-mapping.dmp

Download
memory/684-140-0x0000000000000000-mapping.dmp

Download
memory/1800-139-0x0000000000000000-mapping.dmp

Download
memory/1964-144-0x0000000000000000-mapping.dmp

Download
memory/2116-147-0x0000000000CB0000-0x0000000000CC5000-memory.dmp

Filesize
84KB

Download
memory/2116-146-0x0000000000000000-mapping.dmp

Download
memory/2116-152-0x0000000000CB0000-0x0000000000CC5000-memory.dmp

Filesize
84KB

Download
memory/2116-153-0x0000000000CB0000-0x0000000000CC5000-memory.dmp

Filesize
84KB

Download
memory/2864-136-0x0000000000000000-mapping.dmp

Download
memory/3652-150-0x0000000000DF8000-0x0000000000E09000-memory.dmp

Filesize
68KB

Download
memory/3652-151-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/4200-141-0x0000000000DFD000-0x0000000000E0E000-memory.dmp

Filesize
68KB

Download
memory/4200-142-0x0000000000D30000-0x0000000000D43000-memory.dmp

Filesize
76KB

Download
memory/4200-134-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/4200-133-0x0000000000D30000-0x0000000000D43000-memory.dmp

Filesize
76KB

Download
memory/4200-145-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/4200-132-0x0000000000DFD000-0x0000000000E0E000-memory.dmp

Filesize
68KB

Download

Analysis

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