isrstealer | f1d86efd7551171b8ebfcd44b239bd769a5f17cbac6373bc72788212a0928c07

General

Target

171ff2e20f79aa3737f1d59e232508f9_JaffaCakes118.exe
Size

10.7MB
MD5

171ff2e20f79aa3737f1d59e232508f9
SHA1

edb479ab87c4c47cc32ee5fc107cf9501fc1ae0b
SHA256

f1d86efd7551171b8ebfcd44b239bd769a5f17cbac6373bc72788212a0928c07
SHA512

d8b535e139190e2a3db7924b1094a38d7f843c6ad74bfe2b6ff076d2e4879abb0a5178c434b492635e05d7fd1ffe2ddd7c7c42d14dcf4c732fa0b77f09f0efd7
SSDEEP

196608:HXGiZj9UnUu31F7Vd1M8nIeSXz75cPHOiLw3KHrl7OZ:Hh9UnUu318X7uPcGp2

Score

10^/10

isrstealer discovery stealer trojan upx

Malware Config

Signatures

ISR Stealer
ISR Stealer is a modified version of Hackhound Stealer written in visual basic.
trojan stealer isrstealer

ISR Stealer payload 4 IoCs

resource	yara_rule
behavioral2/memory/3964-3-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/3964-5-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/3964-30-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral2/memory/3964-34-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer

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-1-5-21-523280732-2327480845-3730041215-1000\Control Panel\International\Geo\Nation	171ff2e20f79aa3737f1d59e232508f9_JaffaCakes118.exe

Executes dropped EXE 1 IoCs

pid	Process
3776	TeamViewer.exe

Uses the VBS compiler for execution 1 TTPs

Command and Scripting Interpreter
T1059

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4628 set thread context of 3964	4628	171ff2e20f79aa3737f1d59e232508f9_JaffaCakes118.exe	82
PID 3964 set thread context of 1696	3964	vbc.exe	83

UPX packed file 4 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/1696-8-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1696-11-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1696-13-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/1696-10-0x0000000000400000-0x0000000000453000-memory.dmp	upx

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
1012	3776	WerFault.exe	84

System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	171ff2e20f79aa3737f1d59e232508f9_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	TeamViewer.exe

Modifies system certificate store 2 TTPs 3 IoCs

evasion spyware trojan

Install Root Certificate

T1553.004

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\4EB6D578499B1CCF5F581EAD56BE3D9B6744A5E5	TeamViewer.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\4EB6D578499B1CCF5F581EAD56BE3D9B6744A5E5\Blob = 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	TeamViewer.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\4EB6D578499B1CCF5F581EAD56BE3D9B6744A5E5\Blob = 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	TeamViewer.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3964	vbc.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 4628 wrote to memory of 3964	4628	171ff2e20f79aa3737f1d59e232508f9_JaffaCakes118.exe	82
PID 4628 wrote to memory of 3964	4628	171ff2e20f79aa3737f1d59e232508f9_JaffaCakes118.exe	82
PID 4628 wrote to memory of 3964	4628	171ff2e20f79aa3737f1d59e232508f9_JaffaCakes118.exe	82
PID 4628 wrote to memory of 3964	4628	171ff2e20f79aa3737f1d59e232508f9_JaffaCakes118.exe	82
PID 4628 wrote to memory of 3964	4628	171ff2e20f79aa3737f1d59e232508f9_JaffaCakes118.exe	82
PID 4628 wrote to memory of 3964	4628	171ff2e20f79aa3737f1d59e232508f9_JaffaCakes118.exe	82
PID 4628 wrote to memory of 3964	4628	171ff2e20f79aa3737f1d59e232508f9_JaffaCakes118.exe	82
PID 4628 wrote to memory of 3964	4628	171ff2e20f79aa3737f1d59e232508f9_JaffaCakes118.exe	82
PID 3964 wrote to memory of 1696	3964	vbc.exe	83
PID 3964 wrote to memory of 1696	3964	vbc.exe	83
PID 3964 wrote to memory of 1696	3964	vbc.exe	83
PID 3964 wrote to memory of 1696	3964	vbc.exe	83
PID 3964 wrote to memory of 1696	3964	vbc.exe	83
PID 3964 wrote to memory of 1696	3964	vbc.exe	83
PID 3964 wrote to memory of 1696	3964	vbc.exe	83
PID 3964 wrote to memory of 1696	3964	vbc.exe	83
PID 4628 wrote to memory of 3776	4628	171ff2e20f79aa3737f1d59e232508f9_JaffaCakes118.exe	84
PID 4628 wrote to memory of 3776	4628	171ff2e20f79aa3737f1d59e232508f9_JaffaCakes118.exe	84
PID 4628 wrote to memory of 3776	4628	171ff2e20f79aa3737f1d59e232508f9_JaffaCakes118.exe	84

C:\Users\Admin\AppData\Local\Temp\171ff2e20f79aa3737f1d59e232508f9_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\171ff2e20f79aa3737f1d59e232508f9_JaffaCakes118.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4628
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3964
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\ah9u0VsTFF.ini"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:1696
- C:\Users\Admin\AppData\Local\Temp\TeamViewer.exe
  "C:\Users\Admin\AppData\Local\Temp\TeamViewer.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Modifies system certificate store
  PID:3776
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 3776 -s 1436
    3⤵
    - Program crash
    PID:1012

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 3776 -ip 3776
1⤵
PID:3768

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Subvert Trust Controls

1

T1553

Install Root Certificate

1

T1553.004

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\TeamViewer.exe

Filesize
10.5MB

MD5
bb1cd541ba874ceec4955cf24cc616fd

SHA1
a5e3c6f16901bb9e1de1a685bc7ad07aa5e2acc5

SHA256
99238c9a740d70dfcf48d5bca027c1d71557abea2376cc840bb8aa0e2b126e63

SHA512
ef4351023b7383c6cc391f226e22b0c1b4ede7dae078b9c417ba05d99f0868c0da3d2cc6256f715a315f5611d5c885a22ce8a19336a7bc5dfa951f8924174837

Download Submit
C:\Users\Admin\AppData\Local\Temp\ah9u0VsTFF.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1696-14-0x0000000000460000-0x0000000000529000-memory.dmp

Filesize
804KB

Download
memory/1696-8-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1696-11-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1696-13-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1696-10-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/3964-3-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/3964-5-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/3964-30-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/3964-34-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/4628-0-0x00000000748B2000-0x00000000748B3000-memory.dmp

Filesize
4KB

Download
memory/4628-2-0x00000000748B0000-0x0000000074E61000-memory.dmp

Filesize
5.7MB

Download
memory/4628-28-0x00000000748B0000-0x0000000074E61000-memory.dmp

Filesize
5.7MB

Download
memory/4628-1-0x00000000748B0000-0x0000000074E61000-memory.dmp

Filesize
5.7MB

Download

Analysis

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