tofsee | dc0ec3405d05046753c376f33fcd545d03b4781983d4b26103de9419b4334963

General

Target

file.exe
Size

147KB
MD5

245a32c6b70bf744448625ca6d897a57
SHA1

67a7ca7893d555651eb6a38bc22fb9aeacffcec2
SHA256

dc0ec3405d05046753c376f33fcd545d03b4781983d4b26103de9419b4334963
SHA512

aa40eb9fd15e087b346086421b6efdbecc97980868d1404fa32e8ca90a118f3986aef668554ba67badf1dc58ef88c1d688ebe193fed3d3f5dd435d392d3665af
SSDEEP

3072:GFuoANbriTl655frf0zvNDoM2bTXtFW5mMSjv:JbbrHT0zxnoTeo

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:

itpuleqf.exe

pid process

1216 itpuleqf.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

2028 netsh.exe

pid	process
1216	itpuleqf.exe

pid	process
2028	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\ybeifomm\ImagePath = "C:\\Windows\\SysWOW64\\ybeifomm\\itpuleqf.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-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation file.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

itpuleqf.exe

description pid process target process

PID 1216 set thread context of 4584 1216 itpuleqf.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

1920 sc.exe
4080 sc.exe
4572 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

1428 4940 WerFault.exe file.exe
4048 1216 WerFault.exe itpuleqf.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	file.exe

description	pid	process	target process
PID 1216 set thread context of 4584	1216	itpuleqf.exe	svchost.exe

pid	process
1920	sc.exe
4080	sc.exe
4572	sc.exe

pid	pid_target	process	target process
1428	4940	WerFault.exe	file.exe
4048	1216	WerFault.exe	itpuleqf.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

file.exeitpuleqf.exe

description	pid	process	target process
PID 4940 wrote to memory of 1444	4940	file.exe	cmd.exe
PID 4940 wrote to memory of 1444	4940	file.exe	cmd.exe
PID 4940 wrote to memory of 1444	4940	file.exe	cmd.exe
PID 4940 wrote to memory of 3040	4940	file.exe	cmd.exe
PID 4940 wrote to memory of 3040	4940	file.exe	cmd.exe
PID 4940 wrote to memory of 3040	4940	file.exe	cmd.exe
PID 4940 wrote to memory of 4572	4940	file.exe	sc.exe
PID 4940 wrote to memory of 4572	4940	file.exe	sc.exe
PID 4940 wrote to memory of 4572	4940	file.exe	sc.exe
PID 4940 wrote to memory of 1920	4940	file.exe	sc.exe
PID 4940 wrote to memory of 1920	4940	file.exe	sc.exe
PID 4940 wrote to memory of 1920	4940	file.exe	sc.exe
PID 4940 wrote to memory of 4080	4940	file.exe	sc.exe
PID 4940 wrote to memory of 4080	4940	file.exe	sc.exe
PID 4940 wrote to memory of 4080	4940	file.exe	sc.exe
PID 4940 wrote to memory of 2028	4940	file.exe	netsh.exe
PID 4940 wrote to memory of 2028	4940	file.exe	netsh.exe
PID 4940 wrote to memory of 2028	4940	file.exe	netsh.exe
PID 1216 wrote to memory of 4584	1216	itpuleqf.exe	svchost.exe
PID 1216 wrote to memory of 4584	1216	itpuleqf.exe	svchost.exe
PID 1216 wrote to memory of 4584	1216	itpuleqf.exe	svchost.exe
PID 1216 wrote to memory of 4584	1216	itpuleqf.exe	svchost.exe
PID 1216 wrote to memory of 4584	1216	itpuleqf.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:4940

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ybeifomm\
2⤵
PID:1444

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\itpuleqf.exe" C:\Windows\SysWOW64\ybeifomm\
2⤵
PID:3040

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create ybeifomm binPath= "C:\Windows\SysWOW64\ybeifomm\itpuleqf.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:4572

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description ybeifomm "wifi internet conection"
2⤵
- Launches sc.exe
PID:1920

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start ybeifomm
2⤵
- Launches sc.exe
PID:4080

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:2028

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4940 -s 1040
2⤵
- Program crash
PID:1428

C:\Windows\SysWOW64\ybeifomm\itpuleqf.exe
C:\Windows\SysWOW64\ybeifomm\itpuleqf.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1216

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:4584

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1216 -s 552
2⤵
- Program crash
PID:4048

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4940 -ip 4940
1⤵
PID:1272

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 544 -p 1216 -ip 1216
1⤵
PID:3852

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

New Service

1

T1050

Modify Existing Service

1

T1031

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

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\itpuleqf.exe
Filesize
10.8MB

MD5
96865a8a7fb5b0a59be63acb88df1590

SHA1
b82a27faf44093e43ae0f6b5323ad0a167b2c45c

SHA256
654368e2eef9a6a5bc7249e3cc4c41e19ed5e5a890eb4dfe800647750eff44f0

SHA512
b361c86dc3bbfafe3ca4a7239cb0c50475424f11c803d8e3239f116f47d77d08da5c22a94ecb03c0ece18bd78c1618ea9c056ec0d58b162160479b0a1725439e

Download Submit
C:\Windows\SysWOW64\ybeifomm\itpuleqf.exe
Filesize
10.8MB

MD5
96865a8a7fb5b0a59be63acb88df1590

SHA1
b82a27faf44093e43ae0f6b5323ad0a167b2c45c

SHA256
654368e2eef9a6a5bc7249e3cc4c41e19ed5e5a890eb4dfe800647750eff44f0

SHA512
b361c86dc3bbfafe3ca4a7239cb0c50475424f11c803d8e3239f116f47d77d08da5c22a94ecb03c0ece18bd78c1618ea9c056ec0d58b162160479b0a1725439e

Download Submit
memory/1216-149-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/1216-148-0x0000000000CA8000-0x0000000000CB9000-memory.dmp

Filesize
68KB

Download
memory/1444-132-0x0000000000000000-mapping.dmp

Download
memory/1920-139-0x0000000000000000-mapping.dmp

Download
memory/2028-142-0x0000000000000000-mapping.dmp

Download
memory/3040-136-0x0000000000000000-mapping.dmp

Download
memory/4080-140-0x0000000000000000-mapping.dmp

Download
memory/4572-138-0x0000000000000000-mapping.dmp

Download
memory/4584-144-0x0000000000000000-mapping.dmp

Download
memory/4584-145-0x0000000000E30000-0x0000000000E45000-memory.dmp

Filesize
84KB

Download
memory/4584-150-0x0000000000E30000-0x0000000000E45000-memory.dmp

Filesize
84KB

Download
memory/4584-151-0x0000000000E30000-0x0000000000E45000-memory.dmp

Filesize
84KB

Download
memory/4940-135-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/4940-143-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/4940-134-0x0000000002820000-0x0000000002833000-memory.dmp

Filesize
76KB

Download
memory/4940-133-0x0000000000C5D000-0x0000000000C6E000-memory.dmp

Filesize
68KB

Download

Analysis

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