isrstealer | 33e595babcf67d43afe50976ab1a20f58c8d737b723fbea915943e89d400e6cb

General

Target

JaffaCakes118_baeaafc9f3d5c944ee7e39d2103e3c87.exe
Size

969KB
MD5

baeaafc9f3d5c944ee7e39d2103e3c87
SHA1

5f2e3c22c8fe2dcfbf8df53ba837cdc0c892f054
SHA256

33e595babcf67d43afe50976ab1a20f58c8d737b723fbea915943e89d400e6cb
SHA512

1b7fae35efd59c1816d50da18eba16ae7d7d014b81c5a773b3a72d03cbc40d8e0a19ae3737f75d595fc4ea5c2c213a42c245c07e0256e1269911823b653654af
SSDEEP

24576:BijCOCdlBNl2HvLxeRNEA/qeRdbfSsfFvEQWQeUoZ7U33SAddBLS:BiGrdlfl2PtsNEA/qe3bKQFvbePOHSAc

Score

10^/10

isrstealer discovery persistence spyware 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 3 IoCs

resource	yara_rule
behavioral1/memory/2872-15-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral1/memory/2872-11-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer
behavioral1/memory/2872-35-0x0000000000400000-0x0000000000435000-memory.dmp	family_isrstealer

Isrstealer family
isrstealer

Executes dropped EXE 2 IoCs

pid	Process
2872	twitter.exe
2856	twitter.exe

Loads dropped DLL 2 IoCs

pid	Process
2664	JaffaCakes118_baeaafc9f3d5c944ee7e39d2103e3c87.exe
2872	twitter.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-312935884-697965778-3955649944-1000\Software\Microsoft\Windows\CurrentVersion\Run\Fire fox Update = "C:\\Users\\Admin\\AppData\\Local\\Temp\\JaffaCakes118_baeaafc9f3d5c944ee7e39d2103e3c87.exe"	JaffaCakes118_baeaafc9f3d5c944ee7e39d2103e3c87.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2664 set thread context of 2872	2664	JaffaCakes118_baeaafc9f3d5c944ee7e39d2103e3c87.exe	31
PID 2872 set thread context of 2856	2872	twitter.exe	32

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2856-29-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2856-28-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2856-30-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2856-26-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2856-32-0x0000000000400000-0x0000000000453000-memory.dmp	upx

System Location Discovery: System Language Discovery 1 TTPs 3 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	JaffaCakes118_baeaafc9f3d5c944ee7e39d2103e3c87.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	twitter.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	twitter.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2664	JaffaCakes118_baeaafc9f3d5c944ee7e39d2103e3c87.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2872	twitter.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 2664 wrote to memory of 2872	2664	JaffaCakes118_baeaafc9f3d5c944ee7e39d2103e3c87.exe	31
PID 2664 wrote to memory of 2872	2664	JaffaCakes118_baeaafc9f3d5c944ee7e39d2103e3c87.exe	31
PID 2664 wrote to memory of 2872	2664	JaffaCakes118_baeaafc9f3d5c944ee7e39d2103e3c87.exe	31
PID 2664 wrote to memory of 2872	2664	JaffaCakes118_baeaafc9f3d5c944ee7e39d2103e3c87.exe	31
PID 2664 wrote to memory of 2872	2664	JaffaCakes118_baeaafc9f3d5c944ee7e39d2103e3c87.exe	31
PID 2664 wrote to memory of 2872	2664	JaffaCakes118_baeaafc9f3d5c944ee7e39d2103e3c87.exe	31
PID 2664 wrote to memory of 2872	2664	JaffaCakes118_baeaafc9f3d5c944ee7e39d2103e3c87.exe	31
PID 2664 wrote to memory of 2872	2664	JaffaCakes118_baeaafc9f3d5c944ee7e39d2103e3c87.exe	31
PID 2872 wrote to memory of 2856	2872	twitter.exe	32
PID 2872 wrote to memory of 2856	2872	twitter.exe	32
PID 2872 wrote to memory of 2856	2872	twitter.exe	32
PID 2872 wrote to memory of 2856	2872	twitter.exe	32
PID 2872 wrote to memory of 2856	2872	twitter.exe	32
PID 2872 wrote to memory of 2856	2872	twitter.exe	32
PID 2872 wrote to memory of 2856	2872	twitter.exe	32
PID 2872 wrote to memory of 2856	2872	twitter.exe	32
PID 2872 wrote to memory of 2856	2872	twitter.exe	32

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_baeaafc9f3d5c944ee7e39d2103e3c87.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_baeaafc9f3d5c944ee7e39d2103e3c87.exe"
1⤵
- Loads dropped DLL
- Adds Run key to start application
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2664
- C:\Users\Admin\AppData\Local\Temp\twitter.exe
  C:\Users\Admin\AppData\Local\Temp\twitter.exe
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2872
- - C:\Users\Admin\AppData\Local\Temp\twitter.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\BXpLG39tJ9.ini"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:2856

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

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\BXpLG39tJ9.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
C:\Users\Admin\AppData\Local\Temp\twitter.exe

Filesize
31KB

MD5
ed797d8dc2c92401985d162e42ffa450

SHA1
0f02fc517c7facc4baefde4fe9467fb6488ebabe

SHA256
b746362010a101cb5931bc066f0f4d3fc740c02a68c1f37fc3c8e6c87fd7cb1e

SHA512
e831a6ff987f3ef29982da16afad06938b68eddd43c234ba88d1c96a1b5547f2284baf35cbb3a5bfd75e7f0445d14daa014e0ba00b4db72c67f83f0a314c80c2

Download Submit
memory/2664-1-0x0000000074490000-0x0000000074A3B000-memory.dmp

Filesize
5.7MB

Download
memory/2664-2-0x0000000074490000-0x0000000074A3B000-memory.dmp

Filesize
5.7MB

Download
memory/2664-0-0x0000000074491000-0x0000000074492000-memory.dmp

Filesize
4KB

Download
memory/2664-21-0x0000000074490000-0x0000000074A3B000-memory.dmp

Filesize
5.7MB

Download
memory/2856-30-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2856-32-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2856-26-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2856-29-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2856-28-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2872-15-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/2872-7-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/2872-9-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/2872-11-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download
memory/2872-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2872-35-0x0000000000400000-0x0000000000435000-memory.dmp

Filesize
212KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads