tofsee | 1dd9b91d9204e448403d82f29f1327979781e2b48e37825ba75d9f78e858d95a

General

Target

2308ed21c12b2b43e8e22d1e595ef5e7.exe
Size

10.4MB
MD5

2308ed21c12b2b43e8e22d1e595ef5e7
SHA1

613d67ac63f1229c170412e0d39f6dcb46b5ca5b
SHA256

1dd9b91d9204e448403d82f29f1327979781e2b48e37825ba75d9f78e858d95a
SHA512

401ef803ec044fd1078d0893a926d5dcafd80cf54c7260bb79495b564a83aa8211d4dec2d76b6be1182616eab1db0373de826a6c939792e3fda93fe7e60934dc
SSDEEP

24576:slxdvCcpOKCtBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBT:slzOR

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

defeatwax.ru

refabyd.info

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
2252	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\zkizwmkw\ImagePath = "C:\\Windows\\SysWOW64\\zkizwmkw\\cttmcbcq.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-1-5-21-3803511929-1339359695-2191195476-1000\Control Panel\International\Geo\Nation	2308ed21c12b2b43e8e22d1e595ef5e7.exe

Deletes itself 1 IoCs

pid	Process
60	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
3532	cttmcbcq.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3532 set thread context of 60	3532	cttmcbcq.exe	109

Launches sc.exe 3 IoCs

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

pid	Process
4084	sc.exe
1380	sc.exe
4668	sc.exe

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

System Information Discovery
T1082

Program crash 2 IoCs

pid	pid_target	Process	procid_target
2052	2008	WerFault.exe	89
2256	3532	WerFault.exe	103

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 2008 wrote to memory of 4524	2008	2308ed21c12b2b43e8e22d1e595ef5e7.exe	94
PID 2008 wrote to memory of 4524	2008	2308ed21c12b2b43e8e22d1e595ef5e7.exe	94
PID 2008 wrote to memory of 4524	2008	2308ed21c12b2b43e8e22d1e595ef5e7.exe	94
PID 2008 wrote to memory of 2020	2008	2308ed21c12b2b43e8e22d1e595ef5e7.exe	96
PID 2008 wrote to memory of 2020	2008	2308ed21c12b2b43e8e22d1e595ef5e7.exe	96
PID 2008 wrote to memory of 2020	2008	2308ed21c12b2b43e8e22d1e595ef5e7.exe	96
PID 2008 wrote to memory of 4084	2008	2308ed21c12b2b43e8e22d1e595ef5e7.exe	97
PID 2008 wrote to memory of 4084	2008	2308ed21c12b2b43e8e22d1e595ef5e7.exe	97
PID 2008 wrote to memory of 4084	2008	2308ed21c12b2b43e8e22d1e595ef5e7.exe	97
PID 2008 wrote to memory of 1380	2008	2308ed21c12b2b43e8e22d1e595ef5e7.exe	100
PID 2008 wrote to memory of 1380	2008	2308ed21c12b2b43e8e22d1e595ef5e7.exe	100
PID 2008 wrote to memory of 1380	2008	2308ed21c12b2b43e8e22d1e595ef5e7.exe	100
PID 2008 wrote to memory of 4668	2008	2308ed21c12b2b43e8e22d1e595ef5e7.exe	101
PID 2008 wrote to memory of 4668	2008	2308ed21c12b2b43e8e22d1e595ef5e7.exe	101
PID 2008 wrote to memory of 4668	2008	2308ed21c12b2b43e8e22d1e595ef5e7.exe	101
PID 2008 wrote to memory of 2252	2008	2308ed21c12b2b43e8e22d1e595ef5e7.exe	108
PID 2008 wrote to memory of 2252	2008	2308ed21c12b2b43e8e22d1e595ef5e7.exe	108
PID 2008 wrote to memory of 2252	2008	2308ed21c12b2b43e8e22d1e595ef5e7.exe	108
PID 3532 wrote to memory of 60	3532	cttmcbcq.exe	109
PID 3532 wrote to memory of 60	3532	cttmcbcq.exe	109
PID 3532 wrote to memory of 60	3532	cttmcbcq.exe	109
PID 3532 wrote to memory of 60	3532	cttmcbcq.exe	109
PID 3532 wrote to memory of 60	3532	cttmcbcq.exe	109

C:\Users\Admin\AppData\Local\Temp\2308ed21c12b2b43e8e22d1e595ef5e7.exe
"C:\Users\Admin\AppData\Local\Temp\2308ed21c12b2b43e8e22d1e595ef5e7.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2008
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zkizwmkw\
  2⤵
  PID:4524
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cttmcbcq.exe" C:\Windows\SysWOW64\zkizwmkw\
  2⤵
  PID:2020
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create zkizwmkw binPath= "C:\Windows\SysWOW64\zkizwmkw\cttmcbcq.exe /d\"C:\Users\Admin\AppData\Local\Temp\2308ed21c12b2b43e8e22d1e595ef5e7.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:4084
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description zkizwmkw "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1380
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start zkizwmkw
  2⤵
  - Launches sc.exe
  PID:4668
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2008 -s 672
  2⤵
  - Program crash
  PID:2052
- 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:2252

C:\Windows\SysWOW64\zkizwmkw\cttmcbcq.exe
C:\Windows\SysWOW64\zkizwmkw\cttmcbcq.exe /d"C:\Users\Admin\AppData\Local\Temp\2308ed21c12b2b43e8e22d1e595ef5e7.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3532
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:60
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3532 -s 532
  2⤵
  - Program crash
  PID:2256

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 2008 -ip 2008
1⤵
PID:1164

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 536 -p 3532 -ip 3532
1⤵
PID:2272

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\cttmcbcq.exe

Filesize
1.2MB

MD5
6e2fbe861dfa4d253b34a3b78d6c68f5

SHA1
5e5200651e962a90a7b552f82b15e488501c0de2

SHA256
9828ccc3427eb3bc90c85647340a63535d20c1258ae955c976f92aee22ab5378

SHA512
d19d1d7933fe849e18b2551fdb13e70528d5ce1df368c4982b316e8903cf3881879d07e35a08122de7fcf7e2d9f80d927a0c8117bf3afb0663733f3cf9aae08e

Download Submit
C:\Windows\SysWOW64\zkizwmkw\cttmcbcq.exe

Filesize
1024KB

MD5
aab2181a35e6cae6a99b56c536a963f7

SHA1
2376b4df3f6c553262f41d3b21572d22127a66dd

SHA256
65edfb5b6be67578709bb7793a38c79ba03773ddb0029fe4fd90636dc68fd876

SHA512
dc4783fe18a74fe0ada869686e111639c79e4de393b792f35325b70702f8cf3ecf00c0a96ae98e5ab16e66f32a5921416f50be7e4e218a09851f724e153fa049

Download Submit
memory/60-18-0x0000000000E70000-0x0000000000E85000-memory.dmp

Filesize
84KB

Download
memory/60-16-0x0000000000E70000-0x0000000000E85000-memory.dmp

Filesize
84KB

Download
memory/60-15-0x0000000000E70000-0x0000000000E85000-memory.dmp

Filesize
84KB

Download
memory/60-10-0x0000000000E70000-0x0000000000E85000-memory.dmp

Filesize
84KB

Download
memory/60-19-0x0000000000E70000-0x0000000000E85000-memory.dmp

Filesize
84KB

Download
memory/2008-3-0x0000000000400000-0x0000000000468000-memory.dmp

Filesize
416KB

Download
memory/2008-2-0x0000000000710000-0x0000000000723000-memory.dmp

Filesize
76KB

Download
memory/2008-8-0x0000000000400000-0x0000000000468000-memory.dmp

Filesize
416KB

Download
memory/2008-9-0x0000000000710000-0x0000000000723000-memory.dmp

Filesize
76KB

Download
memory/2008-1-0x00000000007F0000-0x00000000008F0000-memory.dmp

Filesize
1024KB

Download
memory/3532-12-0x0000000000400000-0x0000000000468000-memory.dmp

Filesize
416KB

Download
memory/3532-11-0x00000000006A0000-0x00000000007A0000-memory.dmp

Filesize
1024KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads