isrstealer | 1f98317dbaa020e41fbe16381ee94d8e11ef088f0fac3a44f788fe78f66c7418

General

Target

JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe
Size

339KB
MD5

639a4d1d6ca2c2f4bd724742623d6b20
SHA1

43fbadcd3449f5d5d58d2e327ca0469444460a69
SHA256

1f98317dbaa020e41fbe16381ee94d8e11ef088f0fac3a44f788fe78f66c7418
SHA512

0734be9b90409b2395de6737c5dc0b44fe7b3b8058d8bf3788bf3833ae447159e0241c61a224a1f3145e81b33d25e17bc99f19d94b622871a4cf4fe522c3ca5a
SSDEEP

6144:83ZN/pQ437RzShx9BsxsoalSnEe9aKeVfZh7IMtzr1+dd/Z7zAinpoSg7vIV:MZNf7R4xbBoSSn39aKeV/BJ+VQinKrgV

Score

10^/10

isrstealer collection discovery 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 4 IoCs

resource	yara_rule
behavioral2/memory/3088-5-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3088-8-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3088-20-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3088-27-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

Isrstealer family
isrstealer

Detected Nirsoft tools 3 IoCs

Free utilities often used by attackers which can steal passwords, product keys, etc.

resource	yara_rule
behavioral2/memory/4692-25-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/4692-24-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/4692-26-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/4692-25-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/4692-24-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/4692-26-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

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

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1260 set thread context of 3088	1260	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	84
PID 3088 set thread context of 4664	3088	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	85
PID 3088 set thread context of 4692	3088	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	91

UPX packed file 10 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4664-14-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4664-16-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4664-15-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4664-11-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4664-18-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4692-21-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4692-23-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4692-25-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4692-24-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4692-26-0x0000000000400000-0x000000000041F000-memory.dmp	upx

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	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1260	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1260	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3088	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1260 wrote to memory of 3088	1260	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	84
PID 1260 wrote to memory of 3088	1260	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	84
PID 1260 wrote to memory of 3088	1260	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	84
PID 1260 wrote to memory of 3088	1260	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	84
PID 1260 wrote to memory of 3088	1260	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	84
PID 1260 wrote to memory of 3088	1260	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	84
PID 1260 wrote to memory of 3088	1260	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	84
PID 3088 wrote to memory of 4664	3088	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	85
PID 3088 wrote to memory of 4664	3088	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	85
PID 3088 wrote to memory of 4664	3088	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	85
PID 3088 wrote to memory of 4664	3088	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	85
PID 3088 wrote to memory of 4664	3088	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	85
PID 3088 wrote to memory of 4664	3088	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	85
PID 3088 wrote to memory of 4664	3088	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	85
PID 3088 wrote to memory of 4664	3088	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	85
PID 3088 wrote to memory of 4692	3088	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	91
PID 3088 wrote to memory of 4692	3088	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	91
PID 3088 wrote to memory of 4692	3088	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	91
PID 3088 wrote to memory of 4692	3088	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	91
PID 3088 wrote to memory of 4692	3088	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	91
PID 3088 wrote to memory of 4692	3088	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	91
PID 3088 wrote to memory of 4692	3088	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	91
PID 3088 wrote to memory of 4692	3088	JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe	91

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1260
- C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe
  "C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3088
- - C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\hks6JxQEqn.ini"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:4664
- - C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_639a4d1d6ca2c2f4bd724742623d6b20.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\kdk65PI003.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:4692

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

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

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\hks6JxQEqn.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1260-12-0x0000000075090000-0x0000000075641000-memory.dmp

Filesize
5.7MB

Download
memory/1260-1-0x0000000075090000-0x0000000075641000-memory.dmp

Filesize
5.7MB

Download
memory/1260-2-0x0000000075090000-0x0000000075641000-memory.dmp

Filesize
5.7MB

Download
memory/1260-3-0x0000000075092000-0x0000000075093000-memory.dmp

Filesize
4KB

Download
memory/1260-4-0x0000000075090000-0x0000000075641000-memory.dmp

Filesize
5.7MB

Download
memory/1260-0-0x0000000075092000-0x0000000075093000-memory.dmp

Filesize
4KB

Download
memory/3088-5-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3088-8-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3088-27-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3088-20-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4664-11-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4664-18-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4664-16-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4664-14-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4664-15-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4692-21-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4692-23-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4692-25-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4692-24-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4692-26-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download

Analysis

Sharing