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:

dfitoixy.exe

pid process

576 dfitoixy.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

756 netsh.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

dfitoixy.exe

description pid process target process

PID 576 set thread context of 820 576 dfitoixy.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

2032 sc.exe
984 sc.exe
268 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
576	dfitoixy.exe

pid	process
756	netsh.exe

description	pid	process	target process
PID 576 set thread context of 820	576	dfitoixy.exe	svchost.exe

pid	process
2032	sc.exe
984	sc.exe
268	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

file.exedfitoixy.exe

description	pid	process	target process
PID 2040 wrote to memory of 1708	2040	file.exe	cmd.exe
PID 2040 wrote to memory of 1708	2040	file.exe	cmd.exe
PID 2040 wrote to memory of 1708	2040	file.exe	cmd.exe
PID 2040 wrote to memory of 1708	2040	file.exe	cmd.exe
PID 2040 wrote to memory of 1748	2040	file.exe	cmd.exe
PID 2040 wrote to memory of 1748	2040	file.exe	cmd.exe
PID 2040 wrote to memory of 1748	2040	file.exe	cmd.exe
PID 2040 wrote to memory of 1748	2040	file.exe	cmd.exe
PID 2040 wrote to memory of 268	2040	file.exe	sc.exe
PID 2040 wrote to memory of 268	2040	file.exe	sc.exe
PID 2040 wrote to memory of 268	2040	file.exe	sc.exe
PID 2040 wrote to memory of 268	2040	file.exe	sc.exe
PID 2040 wrote to memory of 2032	2040	file.exe	sc.exe
PID 2040 wrote to memory of 2032	2040	file.exe	sc.exe
PID 2040 wrote to memory of 2032	2040	file.exe	sc.exe
PID 2040 wrote to memory of 2032	2040	file.exe	sc.exe
PID 2040 wrote to memory of 984	2040	file.exe	sc.exe
PID 2040 wrote to memory of 984	2040	file.exe	sc.exe
PID 2040 wrote to memory of 984	2040	file.exe	sc.exe
PID 2040 wrote to memory of 984	2040	file.exe	sc.exe
PID 2040 wrote to memory of 756	2040	file.exe	netsh.exe
PID 2040 wrote to memory of 756	2040	file.exe	netsh.exe
PID 2040 wrote to memory of 756	2040	file.exe	netsh.exe
PID 2040 wrote to memory of 756	2040	file.exe	netsh.exe
PID 576 wrote to memory of 820	576	dfitoixy.exe	svchost.exe
PID 576 wrote to memory of 820	576	dfitoixy.exe	svchost.exe
PID 576 wrote to memory of 820	576	dfitoixy.exe	svchost.exe
PID 576 wrote to memory of 820	576	dfitoixy.exe	svchost.exe
PID 576 wrote to memory of 820	576	dfitoixy.exe	svchost.exe
PID 576 wrote to memory of 820	576	dfitoixy.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:2040

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gvcemevb\
2⤵
PID:1708

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dfitoixy.exe" C:\Windows\SysWOW64\gvcemevb\
2⤵
PID:1748

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create gvcemevb binPath= "C:\Windows\SysWOW64\gvcemevb\dfitoixy.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 gvcemevb "wifi internet conection"
2⤵
- Launches sc.exe
PID:2032

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start gvcemevb
2⤵
- Launches sc.exe
PID:984

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:756

C:\Windows\SysWOW64\gvcemevb\dfitoixy.exe
C:\Windows\SysWOW64\gvcemevb\dfitoixy.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:576

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
PID:820

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

New Service

1

T1050

Modify Existing Service

1

T1031

Privilege Escalation

New Service

1

T1050

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\dfitoixy.exe
Filesize
11.8MB

MD5
1e2bfab709202d8ee92148cc2f2be4de

SHA1
81a3156b233df070c15a34d9253d3dbc7610c6d4

SHA256
e76798c4afe113996fe695aafff1c9f4765f07bd4fdde18060260296a557e141

SHA512
7b41a6531ab9433f54b9dea55ab67442adea1e103272d90e281b2b1724ccf87fb722157edf4c83e2ce3d3c61952b00b61e869b6e772f03e2607d0a0fc2079511

Download Submit
C:\Windows\SysWOW64\gvcemevb\dfitoixy.exe
Filesize
11.8MB

MD5
1e2bfab709202d8ee92148cc2f2be4de

SHA1
81a3156b233df070c15a34d9253d3dbc7610c6d4

SHA256
e76798c4afe113996fe695aafff1c9f4765f07bd4fdde18060260296a557e141

SHA512
7b41a6531ab9433f54b9dea55ab67442adea1e103272d90e281b2b1724ccf87fb722157edf4c83e2ce3d3c61952b00b61e869b6e772f03e2607d0a0fc2079511

Download Submit
memory/268-61-0x0000000000000000-mapping.dmp

Download
memory/576-75-0x0000000000BAB000-0x0000000000BBC000-memory.dmp

Filesize
68KB

Download
memory/576-74-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/756-65-0x0000000000000000-mapping.dmp

Download
memory/820-72-0x0000000000089A6B-mapping.dmp

Download
memory/820-71-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/820-69-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/984-63-0x0000000000000000-mapping.dmp

Download
memory/1708-55-0x0000000000000000-mapping.dmp

Download
memory/1748-59-0x0000000000000000-mapping.dmp

Download
memory/2032-62-0x0000000000000000-mapping.dmp

Download
memory/2040-68-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/2040-67-0x0000000000BEB000-0x0000000000BFC000-memory.dmp

Filesize
68KB

Download
memory/2040-54-0x00000000762D1000-0x00000000762D3000-memory.dmp

Filesize
8KB

Download
memory/2040-58-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/2040-56-0x0000000000BEB000-0x0000000000BFC000-memory.dmp

Filesize
68KB

Download
memory/2040-57-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download

Analysis

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