tofsee | 97e8b8205a9be4ddbed90d7c354a58aab170c15e458564baee9f50e17ca79649

General

Target

file.exe
Size

173KB
MD5

aa022c62898c665e601e15e6e204b86e
SHA1

88d9102b156445328fbfbbf2434ae4d98cf8efc9
SHA256

97e8b8205a9be4ddbed90d7c354a58aab170c15e458564baee9f50e17ca79649
SHA512

23535551c14fd9ec5083d829647464048395ae7eddf1f92235e668205d991a5b335fd715d80f2463102d2c0aee1f5d61e352d21d419a489d7ea0b00ab2b8332c
SSDEEP

3072:EjhcgKXXIyhhlGyO5DEDn3U0gbmke8rvtRt22shyLFw:ECX4yhaZAn3h8/DtRt7L

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

Windows security bypass 2 TTPs 1 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\zgcokxfq = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

ukmzqit.exe

pid process

1760 ukmzqit.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1556 netsh.exe

pid	process
1760	ukmzqit.exe

pid	process
1556	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\zgcokxfq\ImagePath = "C:\\Windows\\SysWOW64\\zgcokxfq\\ukmzqit.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1964 svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

ukmzqit.exe

description pid process target process

PID 1760 set thread context of 1964 1760 ukmzqit.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

560 sc.exe
384 sc.exe
2020 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

pid	process
1964	svchost.exe

description	pid	process	target process
PID 1760 set thread context of 1964	1760	ukmzqit.exe	svchost.exe

pid	process
560	sc.exe
384	sc.exe
2020	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

file.exeukmzqit.exe

description	pid	process	target process
PID 1428 wrote to memory of 956	1428	file.exe	cmd.exe
PID 1428 wrote to memory of 956	1428	file.exe	cmd.exe
PID 1428 wrote to memory of 956	1428	file.exe	cmd.exe
PID 1428 wrote to memory of 956	1428	file.exe	cmd.exe
PID 1428 wrote to memory of 844	1428	file.exe	cmd.exe
PID 1428 wrote to memory of 844	1428	file.exe	cmd.exe
PID 1428 wrote to memory of 844	1428	file.exe	cmd.exe
PID 1428 wrote to memory of 844	1428	file.exe	cmd.exe
PID 1428 wrote to memory of 560	1428	file.exe	sc.exe
PID 1428 wrote to memory of 560	1428	file.exe	sc.exe
PID 1428 wrote to memory of 560	1428	file.exe	sc.exe
PID 1428 wrote to memory of 560	1428	file.exe	sc.exe
PID 1428 wrote to memory of 384	1428	file.exe	sc.exe
PID 1428 wrote to memory of 384	1428	file.exe	sc.exe
PID 1428 wrote to memory of 384	1428	file.exe	sc.exe
PID 1428 wrote to memory of 384	1428	file.exe	sc.exe
PID 1428 wrote to memory of 2020	1428	file.exe	sc.exe
PID 1428 wrote to memory of 2020	1428	file.exe	sc.exe
PID 1428 wrote to memory of 2020	1428	file.exe	sc.exe
PID 1428 wrote to memory of 2020	1428	file.exe	sc.exe
PID 1428 wrote to memory of 1556	1428	file.exe	netsh.exe
PID 1428 wrote to memory of 1556	1428	file.exe	netsh.exe
PID 1428 wrote to memory of 1556	1428	file.exe	netsh.exe
PID 1428 wrote to memory of 1556	1428	file.exe	netsh.exe
PID 1760 wrote to memory of 1964	1760	ukmzqit.exe	svchost.exe
PID 1760 wrote to memory of 1964	1760	ukmzqit.exe	svchost.exe
PID 1760 wrote to memory of 1964	1760	ukmzqit.exe	svchost.exe
PID 1760 wrote to memory of 1964	1760	ukmzqit.exe	svchost.exe
PID 1760 wrote to memory of 1964	1760	ukmzqit.exe	svchost.exe
PID 1760 wrote to memory of 1964	1760	ukmzqit.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1428

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zgcokxfq\
2⤵
PID:956

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ukmzqit.exe" C:\Windows\SysWOW64\zgcokxfq\
2⤵
PID:844

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create zgcokxfq binPath= "C:\Windows\SysWOW64\zgcokxfq\ukmzqit.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:560

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description zgcokxfq "wifi internet conection"
2⤵
- Launches sc.exe
PID:384

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start zgcokxfq
2⤵
- Launches sc.exe
PID:2020

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:1556

C:\Windows\SysWOW64\zgcokxfq\ukmzqit.exe
C:\Windows\SysWOW64\zgcokxfq\ukmzqit.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1760

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
PID:1964

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

Disabling Security Tools

Modify Registry

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\ukmzqit.exe
Filesize
10.1MB

MD5
3591415fc5f73174726ae6971f6c9314

SHA1
ab0f0e87cdc52ec044b54d7496bda7bb448f1141

SHA256
14d93dea048dabb43565aef46fe3c8e0f150279975b06463f352e09288e2d39b

SHA512
e29bcbf2055ec8517761269a8010b76aa30b20886c786b8f2e0d0dad7bbd45e9c29b39bb4af31a43ceccf650f13f3e9ff94a1029545a31595f04c7f6a23074ab

Download Submit
C:\Windows\SysWOW64\zgcokxfq\ukmzqit.exe
Filesize
10.1MB

MD5
3591415fc5f73174726ae6971f6c9314

SHA1
ab0f0e87cdc52ec044b54d7496bda7bb448f1141

SHA256
14d93dea048dabb43565aef46fe3c8e0f150279975b06463f352e09288e2d39b

SHA512
e29bcbf2055ec8517761269a8010b76aa30b20886c786b8f2e0d0dad7bbd45e9c29b39bb4af31a43ceccf650f13f3e9ff94a1029545a31595f04c7f6a23074ab

Download Submit
memory/384-63-0x0000000000000000-mapping.dmp

Download
memory/560-62-0x0000000000000000-mapping.dmp

Download
memory/844-59-0x0000000000000000-mapping.dmp

Download
memory/956-58-0x0000000000000000-mapping.dmp

Download
memory/1428-60-0x00000000008EB000-0x00000000008FC000-memory.dmp

Filesize
68KB

Download
memory/1428-57-0x0000000000400000-0x000000000070D000-memory.dmp

Filesize
3.1MB

Download
memory/1428-55-0x00000000008EB000-0x00000000008FC000-memory.dmp

Filesize
68KB

Download
memory/1428-66-0x00000000008EB000-0x00000000008FC000-memory.dmp

Filesize
68KB

Download
memory/1428-67-0x0000000000400000-0x000000000070D000-memory.dmp

Filesize
3.1MB

Download
memory/1428-56-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/1428-54-0x0000000075591000-0x0000000075593000-memory.dmp

Filesize
8KB

Download
memory/1556-65-0x0000000000000000-mapping.dmp

Download
memory/1760-75-0x00000000002EB000-0x00000000002FC000-memory.dmp

Filesize
68KB

Download
memory/1760-78-0x0000000000400000-0x000000000070D000-memory.dmp

Filesize
3.1MB

Download
memory/1964-71-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1964-74-0x0000000000089A6B-mapping.dmp

Download
memory/1964-73-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1964-80-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1964-81-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2020-64-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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