isrstealer | c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88

General

Target

JaffaCakes118_651b487fd423ec8448f11d23f500ec10.exe
Size

385KB
MD5

651b487fd423ec8448f11d23f500ec10
SHA1

da43197862d2a936b55f96901d12c87f0db983d8
SHA256

c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88
SHA512

bf3508bb2719968aa1b924a073f5e67ac901b26adf1e1b0f834260e3618066cad1aa5029769b539d579408aa80c6c81d07b55328868c778ff50a8ff73dfece1b
SSDEEP

6144:Oex5IamdAAdX+UkKK0r6vpjzWPu9XQRXKJYO3snCo9UJPHmViI:N5IaiAALKmWJWPyXkrksnCWyO

Score

10^/10

isrstealer collection 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/1824-4-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1824-6-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1824-27-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1824-34-0x0000000000400000-0x0000000000442000-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/2492-26-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/2492-28-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/2492-31-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/2492-26-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/2492-28-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/2492-31-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Uses the VBS compiler for execution 1 TTPs

Command and Scripting Interpreter
T1059

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	vbc.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 4144 set thread context of 1824	4144	JaffaCakes118_651b487fd423ec8448f11d23f500ec10.exe	82
PID 1824 set thread context of 2572	1824	vbc.exe	83
PID 1824 set thread context of 2492	1824	vbc.exe	89

UPX packed file 10 IoCs

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

upx

resource	yara_rule
behavioral2/memory/2572-12-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2572-14-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2572-16-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2572-15-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2572-18-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2492-23-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/2492-26-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/2492-28-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/2492-25-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/2492-31-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\Microsoft.NET\Framework\v2.0.50727\config\enterprisesec.config.cch.new	JaffaCakes118_651b487fd423ec8448f11d23f500ec10.exe
File created	C:\Windows\Microsoft.NET\Framework\v2.0.50727\config\security.config.cch.new	JaffaCakes118_651b487fd423ec8448f11d23f500ec10.exe

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_651b487fd423ec8448f11d23f500ec10.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	vbc.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1824	vbc.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 4144 wrote to memory of 1824	4144	JaffaCakes118_651b487fd423ec8448f11d23f500ec10.exe	82
PID 4144 wrote to memory of 1824	4144	JaffaCakes118_651b487fd423ec8448f11d23f500ec10.exe	82
PID 4144 wrote to memory of 1824	4144	JaffaCakes118_651b487fd423ec8448f11d23f500ec10.exe	82
PID 4144 wrote to memory of 1824	4144	JaffaCakes118_651b487fd423ec8448f11d23f500ec10.exe	82
PID 4144 wrote to memory of 1824	4144	JaffaCakes118_651b487fd423ec8448f11d23f500ec10.exe	82
PID 4144 wrote to memory of 1824	4144	JaffaCakes118_651b487fd423ec8448f11d23f500ec10.exe	82
PID 4144 wrote to memory of 1824	4144	JaffaCakes118_651b487fd423ec8448f11d23f500ec10.exe	82
PID 4144 wrote to memory of 1824	4144	JaffaCakes118_651b487fd423ec8448f11d23f500ec10.exe	82
PID 1824 wrote to memory of 2572	1824	vbc.exe	83
PID 1824 wrote to memory of 2572	1824	vbc.exe	83
PID 1824 wrote to memory of 2572	1824	vbc.exe	83
PID 1824 wrote to memory of 2572	1824	vbc.exe	83
PID 1824 wrote to memory of 2572	1824	vbc.exe	83
PID 1824 wrote to memory of 2572	1824	vbc.exe	83
PID 1824 wrote to memory of 2572	1824	vbc.exe	83
PID 1824 wrote to memory of 2572	1824	vbc.exe	83
PID 1824 wrote to memory of 2492	1824	vbc.exe	89
PID 1824 wrote to memory of 2492	1824	vbc.exe	89
PID 1824 wrote to memory of 2492	1824	vbc.exe	89
PID 1824 wrote to memory of 2492	1824	vbc.exe	89
PID 1824 wrote to memory of 2492	1824	vbc.exe	89
PID 1824 wrote to memory of 2492	1824	vbc.exe	89
PID 1824 wrote to memory of 2492	1824	vbc.exe	89
PID 1824 wrote to memory of 2492	1824	vbc.exe	89

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_651b487fd423ec8448f11d23f500ec10.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_651b487fd423ec8448f11d23f500ec10.exe"
1⤵
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4144
- 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:1824
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\idWIGWWbmw.ini"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2572
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\nUDXCprwON.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:2492

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Email Collection

1

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/1824-6-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1824-34-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1824-27-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1824-4-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2492-28-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2492-25-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2492-29-0x0000000000420000-0x00000000004E9000-memory.dmp

Filesize
804KB

Download
memory/2492-23-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2492-26-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2492-31-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2572-14-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2572-16-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2572-15-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2572-18-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2572-12-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4144-3-0x0000000075370000-0x0000000075921000-memory.dmp

Filesize
5.7MB

Download
memory/4144-2-0x0000000075370000-0x0000000075921000-memory.dmp

Filesize
5.7MB

Download
memory/4144-0-0x0000000075372000-0x0000000075373000-memory.dmp

Filesize
4KB

Download
memory/4144-21-0x0000000075370000-0x0000000075921000-memory.dmp

Filesize
5.7MB

Download
memory/4144-1-0x0000000075370000-0x0000000075921000-memory.dmp

Filesize
5.7MB

Download

Analysis

Sharing