gozi_ifsb | 46dc49be65d7165e2a6009854a4f27f0088230199e61e0555cb1bd266535874a

Analysis

max time kernel
154s
max time network
143s
platform
windows7_x64
resource
win7v200722
submitted
11-08-2020 12:30

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General

Target

foo/b6e7c9793cf40153bf8865195e06ecbc.exe

Score

10^/10

gozi_ifsb banker bootkit evasion persistence trojan

Malware Config

Signatures

Gozi, Gozi IFSB
Gozi ISFB is a well-known and widely distributed banking trojan.
banker trojan gozi_ifsb
Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Executes dropped EXE 1 IoCs

pid	Process
1920	Client.exe

Checks BIOS information in registry 2 TTPs 4 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	b6e7c9793cf40153bf8865195e06ecbc.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	Client.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	Client.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	b6e7c9793cf40153bf8865195e06ecbc.exe

Identifies Wine through registry keys 2 TTPs 2 IoCs

Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-403932158-3302036622-1224131197-1000\Software\Wine	b6e7c9793cf40153bf8865195e06ecbc.exe
Key opened	\REGISTRY\USER\S-1-5-21-403932158-3302036622-1224131197-1000\Software\Wine	Client.exe

Loads dropped DLL 1 IoCs

pid	Process
776	b6e7c9793cf40153bf8865195e06ecbc.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-403932158-3302036622-1224131197-1000\Software\Microsoft\Windows\CurrentVersion\Run\MailRuHelp = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\foo\\b6e7c9793cf40153bf8865195e06ecbc.exe\""	b6e7c9793cf40153bf8865195e06ecbc.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	b6e7c9793cf40153bf8865195e06ecbc.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	Client.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
1	ip-api.com

Writes to the Master Boot Record (MBR) 1 TTPs 2 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1067

description	ioc	Process
File opened for modification	\??\PhysicalDrive0	b6e7c9793cf40153bf8865195e06ecbc.exe
File opened for modification	\??\PhysicalDrive0	Client.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
776	b6e7c9793cf40153bf8865195e06ecbc.exe
1920	Client.exe

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Subzero\Client.exe	b6e7c9793cf40153bf8865195e06ecbc.exe
File opened for modification	C:\Program Files (x86)\Subzero\Client.exe	b6e7c9793cf40153bf8865195e06ecbc.exe
File opened for modification	C:\Program Files (x86)\Subzero\Client.exe	Client.exe
File opened for modification	C:\Program Files (x86)\Subzero	Client.exe

Creates scheduled task(s) 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
1884	schtasks.exe
2012	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
776	b6e7c9793cf40153bf8865195e06ecbc.exe
1920	Client.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	776	b6e7c9793cf40153bf8865195e06ecbc.exe
Token: SeDebugPrivilege	1920	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1920	Client.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 776 wrote to memory of 1884	776	b6e7c9793cf40153bf8865195e06ecbc.exe	25
PID 776 wrote to memory of 1884	776	b6e7c9793cf40153bf8865195e06ecbc.exe	25
PID 776 wrote to memory of 1884	776	b6e7c9793cf40153bf8865195e06ecbc.exe	25
PID 776 wrote to memory of 1884	776	b6e7c9793cf40153bf8865195e06ecbc.exe	25
PID 776 wrote to memory of 1920	776	b6e7c9793cf40153bf8865195e06ecbc.exe	27
PID 776 wrote to memory of 1920	776	b6e7c9793cf40153bf8865195e06ecbc.exe	27
PID 776 wrote to memory of 1920	776	b6e7c9793cf40153bf8865195e06ecbc.exe	27
PID 776 wrote to memory of 1920	776	b6e7c9793cf40153bf8865195e06ecbc.exe	27
PID 1920 wrote to memory of 2012	1920	Client.exe	28
PID 1920 wrote to memory of 2012	1920	Client.exe	28
PID 1920 wrote to memory of 2012	1920	Client.exe	28
PID 1920 wrote to memory of 2012	1920	Client.exe	28

C:\Users\Admin\AppData\Local\Temp\foo\b6e7c9793cf40153bf8865195e06ecbc.exe
"C:\Users\Admin\AppData\Local\Temp\foo\b6e7c9793cf40153bf8865195e06ecbc.exe"
1⤵
- Checks BIOS information in registry
- Identifies Wine through registry keys
- Loads dropped DLL
- Adds Run key to start application
- Checks whether UAC is enabled
- Writes to the Master Boot Record (MBR)
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:776
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks" /create /tn "MailRuHelp" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\foo\b6e7c9793cf40153bf8865195e06ecbc.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:1884
- C:\Program Files (x86)\Subzero\Client.exe
  "C:\Program Files (x86)\Subzero\Client.exe"
  2⤵
  - Executes dropped EXE
  - Checks BIOS information in registry
  - Identifies Wine through registry keys
  - Checks whether UAC is enabled
  - Writes to the Master Boot Record (MBR)
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Drops file in Program Files directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1920
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "MailRuHelp" /sc ONLOGON /tr "C:\Program Files (x86)\Subzero\Client.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2012

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Bootkit

T1067

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Modify Registry

T1112

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/776-1-0x00000000050B0000-0x00000000050C1000-memory.dmp

Filesize
68KB

Download
memory/776-2-0x0000000074BE0000-0x00000000752CE000-memory.dmp

Filesize
6.9MB

Download
memory/776-3-0x0000000001030000-0x0000000001031000-memory.dmp

Filesize
4KB

Download
memory/776-0-0x0000000004CA0000-0x0000000004CB1000-memory.dmp

Filesize
68KB

Download
memory/1920-10-0x0000000005280000-0x0000000005291000-memory.dmp

Filesize
68KB

Download
memory/1920-12-0x0000000074BD0000-0x00000000752BE000-memory.dmp

Filesize
6.9MB

Download
memory/1920-13-0x0000000000C70000-0x0000000000C71000-memory.dmp

Filesize
4KB

Download
memory/1920-9-0x0000000004E70000-0x0000000004E81000-memory.dmp

Filesize
68KB

Download