tofsee | 19dd9c0331cc180aa3c5d1b2c7d9b8897274b393c5f36957e10281f3965f9580

General

Target

cf08ecb08edbc52e65c8f40215d1e631.exe
Size

235KB
MD5

cf08ecb08edbc52e65c8f40215d1e631
SHA1

1de7abbfa87a31b694ee92413c83f7a22a55c2f8
SHA256

19dd9c0331cc180aa3c5d1b2c7d9b8897274b393c5f36957e10281f3965f9580
SHA512

2044e021e7d8eed05ca30205eefd65a586fb23c7eb73bd7b5848895ebc49ebe869d103e935c70564ecb0e573bc22cd0d017501934f781254b1bc40b0888327f4
SSDEEP

3072:uXj1yteXDZ65fyY4RxozmJXEoVyROKipzmmpARedR5TPx2qc:2lI6Cz1oAABfARedf0

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
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

1660 netsh.exe

pid	process
1660	netsh.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:

cf08ecb08edbc52e65c8f40215d1e631.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-144354903-2550862337-1367551827-1000\Control Panel\International\Geo\Nation	cf08ecb08edbc52e65c8f40215d1e631.exe

Executes dropped EXE 2 IoCs

Processes:

zxmundyu.exezxmundyu.exe

pid process

4164 zxmundyu.exe
4664 zxmundyu.exe

pid	process
4164	zxmundyu.exe
4664	zxmundyu.exe

Suspicious use of SetThreadContext 2 IoCs

Processes:

cf08ecb08edbc52e65c8f40215d1e631.exezxmundyu.exe

description	pid	process	target process
PID 5076 set thread context of 1752	5076	cf08ecb08edbc52e65c8f40215d1e631.exe	cf08ecb08edbc52e65c8f40215d1e631.exe
PID 4164 set thread context of 4664	4164	zxmundyu.exe	zxmundyu.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

3908 sc.exe
2676 sc.exe
4036 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
3908	sc.exe
2676	sc.exe
4036	sc.exe

Suspicious use of WriteProcessMemory 36 IoCs

Processes:

cf08ecb08edbc52e65c8f40215d1e631.execf08ecb08edbc52e65c8f40215d1e631.exezxmundyu.exe

description	pid	process	target process
PID 5076 wrote to memory of 1752	5076	cf08ecb08edbc52e65c8f40215d1e631.exe	cf08ecb08edbc52e65c8f40215d1e631.exe
PID 5076 wrote to memory of 1752	5076	cf08ecb08edbc52e65c8f40215d1e631.exe	cf08ecb08edbc52e65c8f40215d1e631.exe
PID 5076 wrote to memory of 1752	5076	cf08ecb08edbc52e65c8f40215d1e631.exe	cf08ecb08edbc52e65c8f40215d1e631.exe
PID 5076 wrote to memory of 1752	5076	cf08ecb08edbc52e65c8f40215d1e631.exe	cf08ecb08edbc52e65c8f40215d1e631.exe
PID 5076 wrote to memory of 1752	5076	cf08ecb08edbc52e65c8f40215d1e631.exe	cf08ecb08edbc52e65c8f40215d1e631.exe
PID 5076 wrote to memory of 1752	5076	cf08ecb08edbc52e65c8f40215d1e631.exe	cf08ecb08edbc52e65c8f40215d1e631.exe
PID 5076 wrote to memory of 1752	5076	cf08ecb08edbc52e65c8f40215d1e631.exe	cf08ecb08edbc52e65c8f40215d1e631.exe
PID 5076 wrote to memory of 1752	5076	cf08ecb08edbc52e65c8f40215d1e631.exe	cf08ecb08edbc52e65c8f40215d1e631.exe
PID 5076 wrote to memory of 1752	5076	cf08ecb08edbc52e65c8f40215d1e631.exe	cf08ecb08edbc52e65c8f40215d1e631.exe
PID 1752 wrote to memory of 1492	1752	cf08ecb08edbc52e65c8f40215d1e631.exe	cmd.exe
PID 1752 wrote to memory of 1492	1752	cf08ecb08edbc52e65c8f40215d1e631.exe	cmd.exe
PID 1752 wrote to memory of 1492	1752	cf08ecb08edbc52e65c8f40215d1e631.exe	cmd.exe
PID 1752 wrote to memory of 1984	1752	cf08ecb08edbc52e65c8f40215d1e631.exe	cmd.exe
PID 1752 wrote to memory of 1984	1752	cf08ecb08edbc52e65c8f40215d1e631.exe	cmd.exe
PID 1752 wrote to memory of 1984	1752	cf08ecb08edbc52e65c8f40215d1e631.exe	cmd.exe
PID 1752 wrote to memory of 3908	1752	cf08ecb08edbc52e65c8f40215d1e631.exe	sc.exe
PID 1752 wrote to memory of 3908	1752	cf08ecb08edbc52e65c8f40215d1e631.exe	sc.exe
PID 1752 wrote to memory of 3908	1752	cf08ecb08edbc52e65c8f40215d1e631.exe	sc.exe
PID 1752 wrote to memory of 2676	1752	cf08ecb08edbc52e65c8f40215d1e631.exe	sc.exe
PID 1752 wrote to memory of 2676	1752	cf08ecb08edbc52e65c8f40215d1e631.exe	sc.exe
PID 1752 wrote to memory of 2676	1752	cf08ecb08edbc52e65c8f40215d1e631.exe	sc.exe
PID 1752 wrote to memory of 4036	1752	cf08ecb08edbc52e65c8f40215d1e631.exe	sc.exe
PID 1752 wrote to memory of 4036	1752	cf08ecb08edbc52e65c8f40215d1e631.exe	sc.exe
PID 1752 wrote to memory of 4036	1752	cf08ecb08edbc52e65c8f40215d1e631.exe	sc.exe
PID 4164 wrote to memory of 4664	4164	zxmundyu.exe	zxmundyu.exe
PID 4164 wrote to memory of 4664	4164	zxmundyu.exe	zxmundyu.exe
PID 4164 wrote to memory of 4664	4164	zxmundyu.exe	zxmundyu.exe
PID 4164 wrote to memory of 4664	4164	zxmundyu.exe	zxmundyu.exe
PID 4164 wrote to memory of 4664	4164	zxmundyu.exe	zxmundyu.exe
PID 4164 wrote to memory of 4664	4164	zxmundyu.exe	zxmundyu.exe
PID 4164 wrote to memory of 4664	4164	zxmundyu.exe	zxmundyu.exe
PID 4164 wrote to memory of 4664	4164	zxmundyu.exe	zxmundyu.exe
PID 4164 wrote to memory of 4664	4164	zxmundyu.exe	zxmundyu.exe
PID 1752 wrote to memory of 1660	1752	cf08ecb08edbc52e65c8f40215d1e631.exe	netsh.exe
PID 1752 wrote to memory of 1660	1752	cf08ecb08edbc52e65c8f40215d1e631.exe	netsh.exe
PID 1752 wrote to memory of 1660	1752	cf08ecb08edbc52e65c8f40215d1e631.exe	netsh.exe

C:\Users\Admin\AppData\Local\Temp\cf08ecb08edbc52e65c8f40215d1e631.exe
"C:\Users\Admin\AppData\Local\Temp\cf08ecb08edbc52e65c8f40215d1e631.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:5076

C:\Users\Admin\AppData\Local\Temp\cf08ecb08edbc52e65c8f40215d1e631.exe
"C:\Users\Admin\AppData\Local\Temp\cf08ecb08edbc52e65c8f40215d1e631.exe"
2⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1752

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\uxqeisyt\
3⤵
PID:1492

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zxmundyu.exe" C:\Windows\SysWOW64\uxqeisyt\
3⤵
PID:1984

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create uxqeisyt binPath= "C:\Windows\SysWOW64\uxqeisyt\zxmundyu.exe /d\"C:\Users\Admin\AppData\Local\Temp\cf08ecb08edbc52e65c8f40215d1e631.exe\"" type= own start= auto DisplayName= "wifi support"
3⤵
- Launches sc.exe
PID:3908

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description uxqeisyt "wifi internet conection"
3⤵
- Launches sc.exe
PID:2676

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start uxqeisyt
3⤵
- Launches sc.exe
PID:4036

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
3⤵
- Modifies Windows Firewall
PID:1660

C:\Windows\SysWOW64\uxqeisyt\zxmundyu.exe
C:\Windows\SysWOW64\uxqeisyt\zxmundyu.exe /d"C:\Users\Admin\AppData\Local\Temp\cf08ecb08edbc52e65c8f40215d1e631.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4164

C:\Windows\SysWOW64\uxqeisyt\zxmundyu.exe
C:\Windows\SysWOW64\uxqeisyt\zxmundyu.exe /d"C:\Users\Admin\AppData\Local\Temp\cf08ecb08edbc52e65c8f40215d1e631.exe"
2⤵
- Executes dropped EXE
PID:4664

Network

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

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\zxmundyu.exe
Filesize
10.3MB

MD5
cc9e3d8eb4515ff4493458d485da722a

SHA1
4ea08190db41dfb7f9a647c70803cd87a503bef3

SHA256
e809347525bd728cdca22dcbe8a08beff048bb8d0a13ae149d5d272f4bfca49e

SHA512
16e2b9b64f67be9dff93f09ce11b1d50bb0a7a576057bd02d87639fa71f78354ac06ba99b8921ad010584378be3f74c65679a560655bae1ad5d0c4c246615d18

Download Submit
C:\Windows\SysWOW64\uxqeisyt\zxmundyu.exe
Filesize
10.3MB

MD5
cc9e3d8eb4515ff4493458d485da722a

SHA1
4ea08190db41dfb7f9a647c70803cd87a503bef3

SHA256
e809347525bd728cdca22dcbe8a08beff048bb8d0a13ae149d5d272f4bfca49e

SHA512
16e2b9b64f67be9dff93f09ce11b1d50bb0a7a576057bd02d87639fa71f78354ac06ba99b8921ad010584378be3f74c65679a560655bae1ad5d0c4c246615d18

Download Submit
C:\Windows\SysWOW64\uxqeisyt\zxmundyu.exe
Filesize
10.3MB

MD5
cc9e3d8eb4515ff4493458d485da722a

SHA1
4ea08190db41dfb7f9a647c70803cd87a503bef3

SHA256
e809347525bd728cdca22dcbe8a08beff048bb8d0a13ae149d5d272f4bfca49e

SHA512
16e2b9b64f67be9dff93f09ce11b1d50bb0a7a576057bd02d87639fa71f78354ac06ba99b8921ad010584378be3f74c65679a560655bae1ad5d0c4c246615d18

Download Submit
memory/1752-138-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/1752-140-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/1752-142-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/1752-148-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/4664-152-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/5076-137-0x00000000042A0000-0x00000000042B4000-memory.dmp

Filesize
80KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

Loading Replay Monitor...

Downloads