tofsee | 883fa89f2fd96ce552e767d9d5975e01f534dfeda72cd0d2522bdbdc8808b1e4

General

Target

1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe
Size

270KB
MD5

066793cde98c8983ec676ab7e848dd4e
SHA1

1d35175f44ae52a6238dc9ddd3acc6f6af8f5639
SHA256

1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360
SHA512

139c0fa8ae09817403e2c0d422d52170b8234f899316e10e60c6ebd7de0c3ea099727a8b6ed8e0389b9d2e3cad87b8e7f129091e9840e3120b9aac77f965c21d
SSDEEP

3072:+3BLbpwA+dFGTOxXqS+jK+N1nfBFDR24YYi0Fak7mxqZkO5njIrqokdkun78F:wwnYTOxXV+jFM4c0V7m4d2qokd

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\ycbmdyyo = "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

328 netsh.exe

pid	process
328	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\ycbmdyyo\ImagePath = "C:\\Windows\\SysWOW64\\ycbmdyyo\\igvdwmhd.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1524 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

igvdwmhd.exe

pid process

1824 igvdwmhd.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:

igvdwmhd.exe

description pid process target process

PID 1824 set thread context of 1524 1824 igvdwmhd.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

1212 sc.exe
532 sc.exe
580 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
1524	svchost.exe

pid	process
1824	igvdwmhd.exe

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

description	pid	process	target process
PID 1824 set thread context of 1524	1824	igvdwmhd.exe	svchost.exe

pid	process
1212	sc.exe
532	sc.exe
580	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 = 3cc85a3d14f4080124edb47d450dd49d084297dce82e72baa49913fd2c78731ddd0f612486cd945d24edb47d470dd49d024195daf71261adc06d04fda6e22673bbc9154961cda56811de8349763dedad644490bdb67d24ed935c00c4f58d3c74bbc4103d35fca76e17da814d7639d4f10b4c90d8f6127db9a4593494b48d6729dd9b43053cf4a05d579fc2223064b9f8641ccd8bbd7426e9935902fda8e2377c88f2005469a8946c11d8874a703fe4a4522d109d8d4d04e4383134fdc48d551de4ad035276a6cb2e569bb47d440dd49d642d83d70d5b51dda46d34fe089f571de4ad750534e3a26b0ada81537638e09d642df4bd844d14dda46d34fdc48d541de4ad743d04cd945d24edb47d440dd49d642df4bd844d14dda46d34fdc48d541de4ad74de05cd94	svchost.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exeigvdwmhd.exe

description	pid	process	target process
PID 1728 wrote to memory of 2008	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	cmd.exe
PID 1728 wrote to memory of 2008	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	cmd.exe
PID 1728 wrote to memory of 2008	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	cmd.exe
PID 1728 wrote to memory of 2008	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	cmd.exe
PID 1728 wrote to memory of 1832	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	cmd.exe
PID 1728 wrote to memory of 1832	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	cmd.exe
PID 1728 wrote to memory of 1832	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	cmd.exe
PID 1728 wrote to memory of 1832	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	cmd.exe
PID 1728 wrote to memory of 1212	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	sc.exe
PID 1728 wrote to memory of 1212	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	sc.exe
PID 1728 wrote to memory of 1212	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	sc.exe
PID 1728 wrote to memory of 1212	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	sc.exe
PID 1728 wrote to memory of 532	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	sc.exe
PID 1728 wrote to memory of 532	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	sc.exe
PID 1728 wrote to memory of 532	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	sc.exe
PID 1728 wrote to memory of 532	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	sc.exe
PID 1728 wrote to memory of 580	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	sc.exe
PID 1728 wrote to memory of 580	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	sc.exe
PID 1728 wrote to memory of 580	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	sc.exe
PID 1728 wrote to memory of 580	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	sc.exe
PID 1824 wrote to memory of 1524	1824	igvdwmhd.exe	svchost.exe
PID 1824 wrote to memory of 1524	1824	igvdwmhd.exe	svchost.exe
PID 1824 wrote to memory of 1524	1824	igvdwmhd.exe	svchost.exe
PID 1824 wrote to memory of 1524	1824	igvdwmhd.exe	svchost.exe
PID 1824 wrote to memory of 1524	1824	igvdwmhd.exe	svchost.exe
PID 1824 wrote to memory of 1524	1824	igvdwmhd.exe	svchost.exe
PID 1728 wrote to memory of 328	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	netsh.exe
PID 1728 wrote to memory of 328	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	netsh.exe
PID 1728 wrote to memory of 328	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	netsh.exe
PID 1728 wrote to memory of 328	1728	1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe	netsh.exe

C:\Users\Admin\AppData\Local\Temp\1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe
"C:\Users\Admin\AppData\Local\Temp\1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1728

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ycbmdyyo\
2⤵
PID:2008

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\igvdwmhd.exe" C:\Windows\SysWOW64\ycbmdyyo\
2⤵
PID:1832

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create ycbmdyyo binPath= "C:\Windows\SysWOW64\ycbmdyyo\igvdwmhd.exe /d\"C:\Users\Admin\AppData\Local\Temp\1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1212

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description ycbmdyyo "wifi internet conection"
2⤵
- Launches sc.exe
PID:532

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start ycbmdyyo
2⤵
- Launches sc.exe
PID:580

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:328

C:\Windows\SysWOW64\ycbmdyyo\igvdwmhd.exe
C:\Windows\SysWOW64\ycbmdyyo\igvdwmhd.exe /d"C:\Users\Admin\AppData\Local\Temp\1062c7e1e883e164b85d224cefa62450e507f056fcf8924f133ca9b65abae360.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1824

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:1524

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\igvdwmhd.exe

Filesize
12.7MB

MD5
6eccc9c2507b0cbb2bef7a0bcbe36b81

SHA1
c8e6ba9ccce083445eeb825f584a32c127af52d5

SHA256
bb073f34c26888532dbe2f5489288a827e62cef72c3b9ab0a4d0af934ef23a9e

SHA512
aa29e1d9559b0311b7d59078f0308c0031d194e8ba4f2ea942b54d57833332cae7d8a73eb031e7657b081b6dab179f91cf1f7cef798aa11e817e56bbb1eee65b

Download Submit
C:\Windows\SysWOW64\ycbmdyyo\igvdwmhd.exe

Filesize
12.7MB

MD5
6eccc9c2507b0cbb2bef7a0bcbe36b81

SHA1
c8e6ba9ccce083445eeb825f584a32c127af52d5

SHA256
bb073f34c26888532dbe2f5489288a827e62cef72c3b9ab0a4d0af934ef23a9e

SHA512
aa29e1d9559b0311b7d59078f0308c0031d194e8ba4f2ea942b54d57833332cae7d8a73eb031e7657b081b6dab179f91cf1f7cef798aa11e817e56bbb1eee65b

Download Submit
memory/1524-62-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1524-60-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1524-61-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1524-67-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1524-68-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1524-69-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1524-71-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1728-56-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/1728-66-0x0000000000400000-0x0000000002B71000-memory.dmp

Filesize
39.4MB

Download
memory/1824-63-0x0000000000400000-0x0000000002B71000-memory.dmp

Filesize
39.4MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads