tofsee | b88b9ed4918755d2ee5d4e8ec49915b6b0991cff51fd6d65f75e02757af71d10

General

Target

file.exe
Size

276KB
MD5

010f80610ed8b65773d1a85863c4df30
SHA1

ef9746a7ecc34f0cfd22fec39a4d8b24674abfed
SHA256

b88b9ed4918755d2ee5d4e8ec49915b6b0991cff51fd6d65f75e02757af71d10
SHA512

fc62a6875922e8aa069618baf4c0dd608440b8b6e79c91016d37a094472983f98e4f62dce2aff9334bd5ab7c58408b9e280ab2bb4e1067f3166a144c9c8359d0
SSDEEP

3072:NQge8WCBrrL4v8CVtq5qDGyKdhpHqPmgTDrtQYaVi5MXYhIh3eGjMgG1ao5Lk:NV/Lq8CVnD4h9qPmgTHqpQVuRjMgU

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:

ehqbbxxu.exe

pid process

1212 ehqbbxxu.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

4592 netsh.exe

pid	process
1212	ehqbbxxu.exe

pid	process
4592	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\xatnegcs\ImagePath = "C:\\Windows\\SysWOW64\\xatnegcs\\ehqbbxxu.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-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation file.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

ehqbbxxu.exe

description pid process target process

PID 1212 set thread context of 1408 1212 ehqbbxxu.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

112 sc.exe
2808 sc.exe
4712 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

2628 2632 WerFault.exe file.exe
4820 1212 WerFault.exe ehqbbxxu.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	file.exe

description	pid	process	target process
PID 1212 set thread context of 1408	1212	ehqbbxxu.exe	svchost.exe

pid	process
112	sc.exe
2808	sc.exe
4712	sc.exe

pid	pid_target	process	target process
2628	2632	WerFault.exe	file.exe
4820	1212	WerFault.exe	ehqbbxxu.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

file.exeehqbbxxu.exe

description	pid	process	target process
PID 2632 wrote to memory of 4548	2632	file.exe	cmd.exe
PID 2632 wrote to memory of 4548	2632	file.exe	cmd.exe
PID 2632 wrote to memory of 4548	2632	file.exe	cmd.exe
PID 2632 wrote to memory of 760	2632	file.exe	cmd.exe
PID 2632 wrote to memory of 760	2632	file.exe	cmd.exe
PID 2632 wrote to memory of 760	2632	file.exe	cmd.exe
PID 2632 wrote to memory of 112	2632	file.exe	sc.exe
PID 2632 wrote to memory of 112	2632	file.exe	sc.exe
PID 2632 wrote to memory of 112	2632	file.exe	sc.exe
PID 2632 wrote to memory of 2808	2632	file.exe	sc.exe
PID 2632 wrote to memory of 2808	2632	file.exe	sc.exe
PID 2632 wrote to memory of 2808	2632	file.exe	sc.exe
PID 2632 wrote to memory of 4712	2632	file.exe	sc.exe
PID 2632 wrote to memory of 4712	2632	file.exe	sc.exe
PID 2632 wrote to memory of 4712	2632	file.exe	sc.exe
PID 2632 wrote to memory of 4592	2632	file.exe	netsh.exe
PID 2632 wrote to memory of 4592	2632	file.exe	netsh.exe
PID 2632 wrote to memory of 4592	2632	file.exe	netsh.exe
PID 1212 wrote to memory of 1408	1212	ehqbbxxu.exe	svchost.exe
PID 1212 wrote to memory of 1408	1212	ehqbbxxu.exe	svchost.exe
PID 1212 wrote to memory of 1408	1212	ehqbbxxu.exe	svchost.exe
PID 1212 wrote to memory of 1408	1212	ehqbbxxu.exe	svchost.exe
PID 1212 wrote to memory of 1408	1212	ehqbbxxu.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:2632

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xatnegcs\
2⤵
PID:4548

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ehqbbxxu.exe" C:\Windows\SysWOW64\xatnegcs\
2⤵
PID:760

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create xatnegcs binPath= "C:\Windows\SysWOW64\xatnegcs\ehqbbxxu.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:112

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description xatnegcs "wifi internet conection"
2⤵
- Launches sc.exe
PID:2808

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start xatnegcs
2⤵
- Launches sc.exe
PID:4712

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:4592

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2632 -s 1208
2⤵
- Program crash
PID:2628

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 2632 -ip 2632
1⤵
PID:1136

C:\Windows\SysWOW64\xatnegcs\ehqbbxxu.exe
C:\Windows\SysWOW64\xatnegcs\ehqbbxxu.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1212

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:1408

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1212 -s 212
2⤵
- Program crash
PID:4820

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 1212 -ip 1212
1⤵
PID:4092

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\ehqbbxxu.exe
Filesize
11.0MB

MD5
fe34cb690343ff2cecc5cbb398d49af8

SHA1
1634bce552ad38be6fa954c48ecd15bc07cdd75d

SHA256
cede22eefb182dc79c9389d0d299bc17371809892f35f0224e2e6dede013ecc4

SHA512
6b43192e03eb850e64d8a69e389936bde5cf9357b33fe1b302bf0c4ed8ebac0d1e6dee05961bcd32aead4d9faca189340b552ada2be765d93c42bac7741495cc

Download Submit
C:\Windows\SysWOW64\xatnegcs\ehqbbxxu.exe
Filesize
11.0MB

MD5
fe34cb690343ff2cecc5cbb398d49af8

SHA1
1634bce552ad38be6fa954c48ecd15bc07cdd75d

SHA256
cede22eefb182dc79c9389d0d299bc17371809892f35f0224e2e6dede013ecc4

SHA512
6b43192e03eb850e64d8a69e389936bde5cf9357b33fe1b302bf0c4ed8ebac0d1e6dee05961bcd32aead4d9faca189340b552ada2be765d93c42bac7741495cc

Download Submit
memory/112-138-0x0000000000000000-mapping.dmp

Download
memory/760-136-0x0000000000000000-mapping.dmp

Download
memory/1212-149-0x0000000000400000-0x000000000044A000-memory.dmp

Filesize
296KB

Download
memory/1212-148-0x00000000004A2000-0x00000000004B7000-memory.dmp

Filesize
84KB

Download
memory/1408-145-0x00000000010B0000-0x00000000010C5000-memory.dmp

Filesize
84KB

Download
memory/1408-144-0x0000000000000000-mapping.dmp

Download
memory/1408-150-0x00000000010B0000-0x00000000010C5000-memory.dmp

Filesize
84KB

Download
memory/1408-151-0x00000000010B0000-0x00000000010C5000-memory.dmp

Filesize
84KB

Download
memory/2632-143-0x0000000000400000-0x000000000044A000-memory.dmp

Filesize
296KB

Download
memory/2632-132-0x0000000000707000-0x000000000071D000-memory.dmp

Filesize
88KB

Download
memory/2632-134-0x0000000000400000-0x000000000044A000-memory.dmp

Filesize
296KB

Download
memory/2632-133-0x0000000000670000-0x0000000000683000-memory.dmp

Filesize
76KB

Download
memory/2808-139-0x0000000000000000-mapping.dmp

Download
memory/4548-135-0x0000000000000000-mapping.dmp

Download
memory/4592-141-0x0000000000000000-mapping.dmp

Download
memory/4712-140-0x0000000000000000-mapping.dmp

Download

Analysis

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