tofsee | dc1bc9d08ef773a4d935b0051c240ef1b9f2ce8dcc000063ffdcab1ef6bd1d50

General

Target

file.exe
Size

293KB
MD5

b4da9897cf577c55aa364a57ce6d6ab6
SHA1

8d2c6b7c0496be939c94db11c1deed3761aa36b1
SHA256

dc1bc9d08ef773a4d935b0051c240ef1b9f2ce8dcc000063ffdcab1ef6bd1d50
SHA512

57e0754e00f7e70a21bf6c2a062fe7b76c422b530b62236455689540f2c1ffb22caac3e936cb4f6616db7558a9b2a81a70103d11449c7ac5bb70c9cb38887d02
SSDEEP

3072:mlNvrtDJVoihS660sTdgmfJFXNQ25xSA2SXux02PiaJxas/aT:E5oihS660shgmfLN/50yXuL/a

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

Windows Service
T1543.003

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Windows Service

T1543.003

pid	Process
4984	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\netojlle\ImagePath = "C:\\Windows\\SysWOW64\\netojlle\\kwmznmei.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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1045988481-1457812719-2617974652-1000\Control Panel\International\Geo\Nation	file.exe

Executes dropped EXE 1 IoCs

pid	Process
4304	kwmznmei.exe

Drops file in System32 directory 1 IoCs

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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4304 set thread context of 1704	4304	kwmznmei.exe	103

Launches sc.exe 3 IoCs

Sc.exe is a Windows utlilty to control services on the system.

pid	Process
5072	sc.exe
4996	sc.exe
4976	sc.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2468	1296	WerFault.exe	84

Modifies data under HKEY_USERS 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT\Control Panel\Buses	svchost.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Control Panel\Buses\Config0 = e4be773c5093360024edb47d450dd49d084297dce82e72baa4c01c8aa857e81d401f84f580cd945d24edb47d470dd49d024195daf71261adc06d04fda6e22673bbc9154961cda56813dd8d4f763de0a4644490bdb07b2deb945d06cdf58d3c74bbc4103d29fca66910d5814b703aec9d084295d9e13f4bb4c06d00fdadfd5430d194460830f4a56517edc70f3252a0f40948f490b57a26ea965400ccf58d387287cc186270a4f93824dc814a7434e6af541bccbd606d82ddf03396a0c48d541de5ad743d73a2e6367b9ec60b440dd49d642df4bd0b719330e16d34fdc48e980fe7ad743d05fba67315df86537535e0b35115f4bd844d14dda46d34fdc48d541de4ad743d04cd945d24edb47d440dd49d642df4bd844d14dda46d34fdc48d541de4ad743d042c955d24	svchost.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1296 wrote to memory of 4628	1296	file.exe	89
PID 1296 wrote to memory of 4628	1296	file.exe	89
PID 1296 wrote to memory of 4628	1296	file.exe	89
PID 1296 wrote to memory of 3236	1296	file.exe	91
PID 1296 wrote to memory of 3236	1296	file.exe	91
PID 1296 wrote to memory of 3236	1296	file.exe	91
PID 1296 wrote to memory of 5072	1296	file.exe	93
PID 1296 wrote to memory of 5072	1296	file.exe	93
PID 1296 wrote to memory of 5072	1296	file.exe	93
PID 1296 wrote to memory of 4996	1296	file.exe	95
PID 1296 wrote to memory of 4996	1296	file.exe	95
PID 1296 wrote to memory of 4996	1296	file.exe	95
PID 1296 wrote to memory of 4976	1296	file.exe	97
PID 1296 wrote to memory of 4976	1296	file.exe	97
PID 1296 wrote to memory of 4976	1296	file.exe	97
PID 1296 wrote to memory of 4984	1296	file.exe	99
PID 1296 wrote to memory of 4984	1296	file.exe	99
PID 1296 wrote to memory of 4984	1296	file.exe	99
PID 4304 wrote to memory of 1704	4304	kwmznmei.exe	103
PID 4304 wrote to memory of 1704	4304	kwmznmei.exe	103
PID 4304 wrote to memory of 1704	4304	kwmznmei.exe	103
PID 4304 wrote to memory of 1704	4304	kwmznmei.exe	103
PID 4304 wrote to memory of 1704	4304	kwmznmei.exe	103

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:1296
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\netojlle\
  2⤵
  PID:4628
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\kwmznmei.exe" C:\Windows\SysWOW64\netojlle\
  2⤵
  PID:3236
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create netojlle binPath= "C:\Windows\SysWOW64\netojlle\kwmznmei.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:5072
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description netojlle "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:4996
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start netojlle
  2⤵
  - Launches sc.exe
  PID:4976
- 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:4984
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1296 -s 596
  2⤵
  - Program crash
  PID:2468

C:\Windows\SysWOW64\netojlle\kwmznmei.exe
C:\Windows\SysWOW64\netojlle\kwmznmei.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4304
- 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:1704

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 1296 -ip 1296
1⤵
PID:4528

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 4304 -ip 4304
1⤵
PID:2972

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

2

T1543

Windows Service

2

T1543.003

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

2

T1543

Windows Service

2

T1543.003

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\kwmznmei.exe

Filesize
13.5MB

MD5
4303b6a4acb1bc8305e3307622f1db55

SHA1
6557934d9b5309e2b0888b964a7be7c512a40e45

SHA256
f3ac8bd0f00259f8ff48148d1c0011a8003bd90c98dd6dec3e61c1e5657ea7d8

SHA512
0f30d9ce2f27728ede429e1c5e30a90fe4fad78c8bb0715a3858bdadecb91b94d464276cefdd514190a6b4b26e80aed2ee3e6f32ee15ff62aeddacec73015620

Download Submit
C:\Windows\SysWOW64\netojlle\kwmznmei.exe

Filesize
13.5MB

MD5
4303b6a4acb1bc8305e3307622f1db55

SHA1
6557934d9b5309e2b0888b964a7be7c512a40e45

SHA256
f3ac8bd0f00259f8ff48148d1c0011a8003bd90c98dd6dec3e61c1e5657ea7d8

SHA512
0f30d9ce2f27728ede429e1c5e30a90fe4fad78c8bb0715a3858bdadecb91b94d464276cefdd514190a6b4b26e80aed2ee3e6f32ee15ff62aeddacec73015620

Download Submit
memory/1296-13-0x0000000000400000-0x0000000002287000-memory.dmp

Filesize
30.5MB

Download
memory/1296-2-0x0000000003FD0000-0x0000000003FE3000-memory.dmp

Filesize
76KB

Download
memory/1296-6-0x0000000000400000-0x0000000002287000-memory.dmp

Filesize
30.5MB

Download
memory/1296-7-0x0000000003FD0000-0x0000000003FE3000-memory.dmp

Filesize
76KB

Download
memory/1296-3-0x0000000000400000-0x0000000002287000-memory.dmp

Filesize
30.5MB

Download
memory/1296-9-0x0000000000400000-0x0000000002287000-memory.dmp

Filesize
30.5MB

Download
memory/1296-1-0x00000000023C0000-0x00000000024C0000-memory.dmp

Filesize
1024KB

Download
memory/1296-4-0x00000000023C0000-0x00000000024C0000-memory.dmp

Filesize
1024KB

Download
memory/1704-20-0x0000000000950000-0x0000000000965000-memory.dmp

Filesize
84KB

Download
memory/1704-24-0x0000000000950000-0x0000000000965000-memory.dmp

Filesize
84KB

Download
memory/1704-27-0x0000000000950000-0x0000000000965000-memory.dmp

Filesize
84KB

Download
memory/1704-33-0x0000000000950000-0x0000000000965000-memory.dmp

Filesize
84KB

Download
memory/4304-17-0x00000000023C0000-0x00000000024C0000-memory.dmp

Filesize
1024KB

Download
memory/4304-18-0x0000000000400000-0x0000000002287000-memory.dmp

Filesize
30.5MB

Download
memory/4304-21-0x0000000000400000-0x0000000002287000-memory.dmp

Filesize
30.5MB

Download
memory/4304-25-0x00000000023C0000-0x00000000024C0000-memory.dmp

Filesize
1024KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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