tofsee | e3c7793b26883da4922c5bc91a769b0c1345badc04c967e5f89177aaf8364ea7

General

Target

file.exe
Size

265KB
MD5

cd8743aa91752e2e02571b2fe3a1c27b
SHA1

3ba45028288170cfa3f137f5ce8924f0fbf6d36f
SHA256

e3c7793b26883da4922c5bc91a769b0c1345badc04c967e5f89177aaf8364ea7
SHA512

903cf7987825b983fcb7b87ef2900c61dbb5e92ded53191839be2ddf68cf09849fdd7399ae10766d9e5d1f5aa89dd1d4e32f6024e96bd7dac3645c5939017274
SSDEEP

3072:FzSyRHyNFTsVxLZfLOAFGCluuTqoJUR1d5rFIjRu4xDYFLdBL5kMpDCU3wsUf2:9P5yNmVxLt4KmoaR1d5ralfxDYRSMp

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

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\xsotsdup = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1012 netsh.exe

pid	process
1012	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\xsotsdup\ImagePath = "C:\\Windows\\SysWOW64\\xsotsdup\\tahkzngq.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1788 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

tahkzngq.exe

pid process

672 tahkzngq.exe
Drops file in System32 directory 1 IoCs

Processes:

svchost.exe

description ioc process

File created C:\Windows\SysWOW64\config\systemprofile:.repos svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

tahkzngq.exe

description pid process target process

PID 672 set thread context of 1788 672 tahkzngq.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

268 sc.exe
1748 sc.exe
1412 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
1788	svchost.exe

pid	process
672	tahkzngq.exe

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

description	pid	process	target process
PID 672 set thread context of 1788	672	tahkzngq.exe	svchost.exe

pid	process
268	sc.exe
1748	sc.exe
1412	sc.exe

Modifies data under HKEY_USERS 2 IoCs

Processes:

svchost.exe

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

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

file.exetahkzngq.exe

description	pid	process	target process
PID 1500 wrote to memory of 904	1500	file.exe	cmd.exe
PID 1500 wrote to memory of 904	1500	file.exe	cmd.exe
PID 1500 wrote to memory of 904	1500	file.exe	cmd.exe
PID 1500 wrote to memory of 904	1500	file.exe	cmd.exe
PID 1500 wrote to memory of 1000	1500	file.exe	cmd.exe
PID 1500 wrote to memory of 1000	1500	file.exe	cmd.exe
PID 1500 wrote to memory of 1000	1500	file.exe	cmd.exe
PID 1500 wrote to memory of 1000	1500	file.exe	cmd.exe
PID 1500 wrote to memory of 268	1500	file.exe	sc.exe
PID 1500 wrote to memory of 268	1500	file.exe	sc.exe
PID 1500 wrote to memory of 268	1500	file.exe	sc.exe
PID 1500 wrote to memory of 268	1500	file.exe	sc.exe
PID 1500 wrote to memory of 1748	1500	file.exe	sc.exe
PID 1500 wrote to memory of 1748	1500	file.exe	sc.exe
PID 1500 wrote to memory of 1748	1500	file.exe	sc.exe
PID 1500 wrote to memory of 1748	1500	file.exe	sc.exe
PID 1500 wrote to memory of 1412	1500	file.exe	sc.exe
PID 1500 wrote to memory of 1412	1500	file.exe	sc.exe
PID 1500 wrote to memory of 1412	1500	file.exe	sc.exe
PID 1500 wrote to memory of 1412	1500	file.exe	sc.exe
PID 1500 wrote to memory of 1012	1500	file.exe	netsh.exe
PID 1500 wrote to memory of 1012	1500	file.exe	netsh.exe
PID 1500 wrote to memory of 1012	1500	file.exe	netsh.exe
PID 1500 wrote to memory of 1012	1500	file.exe	netsh.exe
PID 672 wrote to memory of 1788	672	tahkzngq.exe	svchost.exe
PID 672 wrote to memory of 1788	672	tahkzngq.exe	svchost.exe
PID 672 wrote to memory of 1788	672	tahkzngq.exe	svchost.exe
PID 672 wrote to memory of 1788	672	tahkzngq.exe	svchost.exe
PID 672 wrote to memory of 1788	672	tahkzngq.exe	svchost.exe
PID 672 wrote to memory of 1788	672	tahkzngq.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:1500

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xsotsdup\
2⤵
PID:904

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tahkzngq.exe" C:\Windows\SysWOW64\xsotsdup\
2⤵
PID:1000

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create xsotsdup binPath= "C:\Windows\SysWOW64\xsotsdup\tahkzngq.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:268

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description xsotsdup "wifi internet conection"
2⤵
- Launches sc.exe
PID:1748

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start xsotsdup
2⤵
- Launches sc.exe
PID:1412

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:1012

C:\Windows\SysWOW64\xsotsdup\tahkzngq.exe
C:\Windows\SysWOW64\xsotsdup\tahkzngq.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:672

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
- Drops file in System32 directory
- Modifies data under HKEY_USERS
PID:1788

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\tahkzngq.exe
Filesize
11.5MB

MD5
0b02920c9b121a991fb41893ea8e1f62

SHA1
c6ae2d3f4d8648396396d359551cdf4e839696ca

SHA256
72f1ef720ed7e78483b5cfa1dc0207bd88f7a76532ba8340bcd9837173e7c728

SHA512
304a9341e964aa87b0e5167e34f56f2762bf779ce31a2d3e32c5afcd392807e16b5866fc713c88721b1ce47dfa5ed7cdb6c22a931d4cad3c27606c07a0d9597b

Download Submit
C:\Windows\SysWOW64\xsotsdup\tahkzngq.exe
Filesize
11.5MB

MD5
0b02920c9b121a991fb41893ea8e1f62

SHA1
c6ae2d3f4d8648396396d359551cdf4e839696ca

SHA256
72f1ef720ed7e78483b5cfa1dc0207bd88f7a76532ba8340bcd9837173e7c728

SHA512
304a9341e964aa87b0e5167e34f56f2762bf779ce31a2d3e32c5afcd392807e16b5866fc713c88721b1ce47dfa5ed7cdb6c22a931d4cad3c27606c07a0d9597b

Download Submit
memory/672-67-0x0000000000400000-0x0000000000705000-memory.dmp

Filesize
3.0MB

Download
memory/1500-56-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/1500-60-0x0000000000400000-0x0000000000705000-memory.dmp

Filesize
3.0MB

Download
memory/1788-62-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1788-63-0x00000000000D0000-0x00000000000E5000-memory.dmp

Filesize
84KB

Download
memory/1788-61-0x00000000000D0000-0x00000000000E5000-memory.dmp

Filesize
84KB

Download
memory/1788-66-0x00000000000D0000-0x00000000000E5000-memory.dmp

Filesize
84KB

Download
memory/1788-68-0x00000000000D0000-0x00000000000E5000-memory.dmp

Filesize
84KB

Download
memory/1788-69-0x00000000000D0000-0x00000000000E5000-memory.dmp

Filesize
84KB

Download
memory/1788-71-0x00000000000D0000-0x00000000000E5000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads