tofsee | 4ffd8a5153b680b86b258bde87319885182c5e078cc0c0b16ab64009f7c69979

Analysis

max time kernel
146s
max time network
155s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
02/12/2022, 06:59

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General

Target
file.exe
Size 276KB
Sample221202-hr4jfsge3s
SHA256 4ffd8a5153b680b86b258bde87319885182c5e078cc0c0b16ab64009f7c69979
MD5 8861c3fedd83a41ca2637215c3bea553
SHA1 9394b1527afa8de77c962e0895c681819cb2a529
SHA512 f1e21803aee16d146737284e491685e084b3d0a65e42986d4a4c5233f4860d309e7aa12cd8516baca7ad9384dd8ac43f67fdd2866e7e4b453b184e458eb87653
SSDEEP 3072:exZL86CsL1KL6+tq5qt0OETP2F4HaNMX027CP1JTJbLCrhIh3eGjMgG1ao5Lk:NVsLML6+nt07J8OrOHNPSuRjMgU
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

svartalfheim.top
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

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\xaiitnqp = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050

Executes dropped EXE 1 IoCs

pid	Process
1764	hkteeaax.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
1748	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\xaiitnqp\ImagePath = "C:\\Windows\\SysWOW64\\xaiitnqp\\hkteeaax.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
1856	svchost.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1764 set thread context of 1856	1764	hkteeaax.exe	39

Launches sc.exe 3 IoCs

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

pid	Process
1416	sc.exe
1092	sc.exe
1120	sc.exe

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

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1752 wrote to memory of 1860	1752	file.exe	26
PID 1752 wrote to memory of 1860	1752	file.exe	26
PID 1752 wrote to memory of 1860	1752	file.exe	26
PID 1752 wrote to memory of 1860	1752	file.exe	26
PID 1752 wrote to memory of 1528	1752	file.exe	28
PID 1752 wrote to memory of 1528	1752	file.exe	28
PID 1752 wrote to memory of 1528	1752	file.exe	28
PID 1752 wrote to memory of 1528	1752	file.exe	28
PID 1752 wrote to memory of 1416	1752	file.exe	30
PID 1752 wrote to memory of 1416	1752	file.exe	30
PID 1752 wrote to memory of 1416	1752	file.exe	30
PID 1752 wrote to memory of 1416	1752	file.exe	30
PID 1752 wrote to memory of 1092	1752	file.exe	32
PID 1752 wrote to memory of 1092	1752	file.exe	32
PID 1752 wrote to memory of 1092	1752	file.exe	32
PID 1752 wrote to memory of 1092	1752	file.exe	32
PID 1752 wrote to memory of 1120	1752	file.exe	34
PID 1752 wrote to memory of 1120	1752	file.exe	34
PID 1752 wrote to memory of 1120	1752	file.exe	34
PID 1752 wrote to memory of 1120	1752	file.exe	34
PID 1752 wrote to memory of 1748	1752	file.exe	36
PID 1752 wrote to memory of 1748	1752	file.exe	36
PID 1752 wrote to memory of 1748	1752	file.exe	36
PID 1752 wrote to memory of 1748	1752	file.exe	36
PID 1764 wrote to memory of 1856	1764	hkteeaax.exe	39
PID 1764 wrote to memory of 1856	1764	hkteeaax.exe	39
PID 1764 wrote to memory of 1856	1764	hkteeaax.exe	39
PID 1764 wrote to memory of 1856	1764	hkteeaax.exe	39
PID 1764 wrote to memory of 1856	1764	hkteeaax.exe	39
PID 1764 wrote to memory of 1856	1764	hkteeaax.exe	39

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1752
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xaiitnqp\
  2⤵
  PID:1860
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hkteeaax.exe" C:\Windows\SysWOW64\xaiitnqp\
  2⤵
  PID:1528
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create xaiitnqp binPath= "C:\Windows\SysWOW64\xaiitnqp\hkteeaax.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:1416
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description xaiitnqp "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1092
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start xaiitnqp
  2⤵
  - Launches sc.exe
  PID:1120
- 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:1748

C:\Windows\SysWOW64\xaiitnqp\hkteeaax.exe
C:\Windows\SysWOW64\xaiitnqp\hkteeaax.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1764
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:1856

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

T1031

New Service

T1050

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

New Service

T1050

Defense Evasion

Disabling Security Tools

T1089

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

hkteeaax.exe

Path C:\Users\Admin\AppData\Local\Temp\hkteeaax.exe
Size 14.4MB
SHA256 e8422ca305bd7fc41e06f68d60a466d21e41989e122248598a2baa59aa271126
MD5 dbb395d753333a068810ac57d8ce01ec
SHA1 b98cad2fd649040ef1c2584a0a4283b0245cc595
SHA512 df7281cac9bf0d4e0328d0b40e94b4b4a54f9597c50a995a6efc664ea609f1a291b015b0e7852a6f3ba09a60e953cc60753d9e3dd8c77d33740765e4869fac7b
SSDEEP 3072:/xZL86CsL1KL6+tq5qt0OETP2F4HaNMX027CP1JTJbLCrhIh3eGjMgG1ao5Lkmmz:0VsLML6+nt07J8OrOHNPSuRjMgU
MD5 SHA1 SHA512 SSDEEP

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hkteeaax.exe

Path C:\Windows\SysWOW64\xaiitnqp\hkteeaax.exe
Size 14.4MB
SHA256 e8422ca305bd7fc41e06f68d60a466d21e41989e122248598a2baa59aa271126
MD5 dbb395d753333a068810ac57d8ce01ec
SHA1 b98cad2fd649040ef1c2584a0a4283b0245cc595
SHA512 df7281cac9bf0d4e0328d0b40e94b4b4a54f9597c50a995a6efc664ea609f1a291b015b0e7852a6f3ba09a60e953cc60753d9e3dd8c77d33740765e4869fac7b
SSDEEP 3072:/xZL86CsL1KL6+tq5qt0OETP2F4HaNMX027CP1JTJbLCrhIh3eGjMgG1ao5Lkmmz:0VsLML6+nt07J8OrOHNPSuRjMgU
MD5 SHA1 SHA512 SSDEEP

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memory/1752-55-0x000000000057A000-0x000000000058F000-memory.dmp

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memory/1752-57-0x0000000000400000-0x000000000044A000-memory.dmp

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memory/1752-56-0x0000000000020000-0x0000000000033000-memory.dmp

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memory/1752-54-0x0000000076681000-0x0000000076683000-memory.dmp

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memory/1752-65-0x000000000057A000-0x000000000058F000-memory.dmp

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memory/1752-66-0x0000000000400000-0x000000000044A000-memory.dmp

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memory/1764-74-0x000000000026A000-0x000000000027F000-memory.dmp

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memory/1764-77-0x0000000000400000-0x000000000044A000-memory.dmp

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memory/1856-78-0x00000000000C0000-0x00000000000D5000-memory.dmp

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memory/1856-71-0x00000000000C0000-0x00000000000D5000-memory.dmp

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memory/1856-69-0x00000000000C0000-0x00000000000D5000-memory.dmp

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memory/1856-80-0x00000000000C0000-0x00000000000D5000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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