tofsee | 0c2e01cf79746b2f2824d9f39dc28a5b28a36ea0d3866395ad8ed30e961e7ad1

General

Target

file.exe
Size

322KB
MD5

47446aab4c244063fa5b4852650093e0
SHA1

383d4023a79edd924cad180666ea969613fdec4d
SHA256

0c2e01cf79746b2f2824d9f39dc28a5b28a36ea0d3866395ad8ed30e961e7ad1
SHA512

f28183ad13ca4c9bd79d11e18779f2a4cf6ed3500f0ca5015443a4b075a87090d2f008ee8d4b980eca396f99b580cae371085137ca69d4df75c4194a46e48c4f
SSDEEP

3072:qfz6kXLWSkKDRKs8SgL8ZridHKS7WALXQSYC1//+sxA7rNAMV+v3:eHLLkKYs8SxrGHzqcYClRkM

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
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

4528 netsh.exe

pid	process
4528	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\xovvyqam\ImagePath = "C:\\Windows\\SysWOW64\\xovvyqam\\rcydunzo.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-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation file.exe
Executes dropped EXE 1 IoCs

Processes:

rcydunzo.exe

pid process

344 rcydunzo.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:

rcydunzo.exe

description pid process target process

PID 344 set thread context of 2756 344 rcydunzo.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

3572 sc.exe
1748 sc.exe
1060 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

3016 1980 WerFault.exe file.exe
4056 344 WerFault.exe rcydunzo.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation	file.exe

pid	process
344	rcydunzo.exe

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

description	pid	process	target process
PID 344 set thread context of 2756	344	rcydunzo.exe	svchost.exe

pid	process
3572	sc.exe
1748	sc.exe
1060	sc.exe

pid	pid_target	process	target process
3016	1980	WerFault.exe	file.exe
4056	344	WerFault.exe	rcydunzo.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 23 IoCs

Processes:

file.exercydunzo.exe

description	pid	process	target process
PID 1980 wrote to memory of 5064	1980	file.exe	cmd.exe
PID 1980 wrote to memory of 5064	1980	file.exe	cmd.exe
PID 1980 wrote to memory of 5064	1980	file.exe	cmd.exe
PID 1980 wrote to memory of 384	1980	file.exe	cmd.exe
PID 1980 wrote to memory of 384	1980	file.exe	cmd.exe
PID 1980 wrote to memory of 384	1980	file.exe	cmd.exe
PID 1980 wrote to memory of 1060	1980	file.exe	sc.exe
PID 1980 wrote to memory of 1060	1980	file.exe	sc.exe
PID 1980 wrote to memory of 1060	1980	file.exe	sc.exe
PID 1980 wrote to memory of 3572	1980	file.exe	sc.exe
PID 1980 wrote to memory of 3572	1980	file.exe	sc.exe
PID 1980 wrote to memory of 3572	1980	file.exe	sc.exe
PID 1980 wrote to memory of 1748	1980	file.exe	sc.exe
PID 1980 wrote to memory of 1748	1980	file.exe	sc.exe
PID 1980 wrote to memory of 1748	1980	file.exe	sc.exe
PID 1980 wrote to memory of 4528	1980	file.exe	netsh.exe
PID 1980 wrote to memory of 4528	1980	file.exe	netsh.exe
PID 1980 wrote to memory of 4528	1980	file.exe	netsh.exe
PID 344 wrote to memory of 2756	344	rcydunzo.exe	svchost.exe
PID 344 wrote to memory of 2756	344	rcydunzo.exe	svchost.exe
PID 344 wrote to memory of 2756	344	rcydunzo.exe	svchost.exe
PID 344 wrote to memory of 2756	344	rcydunzo.exe	svchost.exe
PID 344 wrote to memory of 2756	344	rcydunzo.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:1980

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xovvyqam\
2⤵
PID:5064

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rcydunzo.exe" C:\Windows\SysWOW64\xovvyqam\
2⤵
PID:384

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create xovvyqam binPath= "C:\Windows\SysWOW64\xovvyqam\rcydunzo.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1060

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description xovvyqam "wifi internet conection"
2⤵
- Launches sc.exe
PID:3572

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start xovvyqam
2⤵
- Launches sc.exe
PID:1748

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:4528

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1980 -s 1036
2⤵
- Program crash
PID:3016

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 396 -p 1980 -ip 1980
1⤵
PID:1940

C:\Windows\SysWOW64\xovvyqam\rcydunzo.exe
C:\Windows\SysWOW64\xovvyqam\rcydunzo.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:344

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
- Drops file in System32 directory
- Modifies data under HKEY_USERS
PID:2756

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 344 -s 408
2⤵
- Program crash
PID:4056

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 520 -p 344 -ip 344
1⤵
PID:4172

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

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\rcydunzo.exe
Filesize
13.4MB

MD5
9a5f832655a8fb46ce02c999abc58ac7

SHA1
2f790723304383a98463171a604ab782db95cf5c

SHA256
183cf65bb4adde1c739871145590640d2abeb6912c848b3a02ebc720f7859eb0

SHA512
41f8dc6674cf8c9b241ac8f35868c34cc1b44dbcf7bb04a1ea15301038b2799ba19bbc938cdeefaec1279df9ca8c177824ed2c57758925503551db5159b79fe2

Download Submit
C:\Windows\SysWOW64\xovvyqam\rcydunzo.exe
Filesize
13.4MB

MD5
9a5f832655a8fb46ce02c999abc58ac7

SHA1
2f790723304383a98463171a604ab782db95cf5c

SHA256
183cf65bb4adde1c739871145590640d2abeb6912c848b3a02ebc720f7859eb0

SHA512
41f8dc6674cf8c9b241ac8f35868c34cc1b44dbcf7bb04a1ea15301038b2799ba19bbc938cdeefaec1279df9ca8c177824ed2c57758925503551db5159b79fe2

Download Submit
memory/344-150-0x0000000000400000-0x000000000046B000-memory.dmp

Filesize
428KB

Download
memory/344-149-0x0000000000669000-0x000000000067F000-memory.dmp

Filesize
88KB

Download
memory/384-136-0x0000000000000000-mapping.dmp

Download
memory/1060-138-0x0000000000000000-mapping.dmp

Download
memory/1748-140-0x0000000000000000-mapping.dmp

Download
memory/1980-132-0x00000000004AE000-0x00000000004C4000-memory.dmp

Filesize
88KB

Download
memory/1980-143-0x00000000004AE000-0x00000000004C4000-memory.dmp

Filesize
88KB

Download
memory/1980-144-0x0000000000400000-0x000000000046B000-memory.dmp

Filesize
428KB

Download
memory/1980-134-0x0000000000400000-0x000000000046B000-memory.dmp

Filesize
428KB

Download
memory/1980-133-0x0000000000470000-0x0000000000483000-memory.dmp

Filesize
76KB

Download
memory/2756-145-0x0000000000000000-mapping.dmp

Download
memory/2756-146-0x0000000000770000-0x0000000000785000-memory.dmp

Filesize
84KB

Download
memory/2756-151-0x0000000000770000-0x0000000000785000-memory.dmp

Filesize
84KB

Download
memory/2756-152-0x0000000000770000-0x0000000000785000-memory.dmp

Filesize
84KB

Download
memory/3572-139-0x0000000000000000-mapping.dmp

Download
memory/4528-141-0x0000000000000000-mapping.dmp

Download
memory/5064-135-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads