isrstealer | 6297c416960bf4cba1132068c6db37874c3fec70e641b3200ab9c84b56d4b196

General

Target

35a17271da1a5f66444b085d959e0c9b_JaffaCakes118.exe
Size

1.1MB
MD5

35a17271da1a5f66444b085d959e0c9b
SHA1

ea76bfbc822f55ec1a1d3fe344d8abcc0e677553
SHA256

6297c416960bf4cba1132068c6db37874c3fec70e641b3200ab9c84b56d4b196
SHA512

96ab18423db1d9b9c689f4801d6e6bd51caa2c0b0258272bcc24bca4cfbe510a84249a025c5c53547b00947916b0c7b364163f87e0f1e9ff70601987fd9adb8f
SSDEEP

24576:yNV/yP0x2lw0AzLNH2smWuaG7c1W1UiNJGnf:GyP04wNtmWu1kW1

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/3820-3-0x0000000000400000-0x00000000004AB000-memory.dmp	family_isrstealer
behavioral2/memory/3820-6-0x0000000000400000-0x00000000004AB000-memory.dmp	family_isrstealer
behavioral2/memory/3820-25-0x0000000000400000-0x00000000004AB000-memory.dmp	family_isrstealer
behavioral2/memory/3820-31-0x0000000000400000-0x00000000004AB000-memory.dmp	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/3076-24-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/3076-26-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/3076-29-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/3076-24-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/3076-26-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/3076-29-0x0000000000400000-0x000000000041F000-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-1-5-21-3350944739-639801879-157714471-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	vbc.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 3592 set thread context of 3820	3592	35a17271da1a5f66444b085d959e0c9b_JaffaCakes118.exe	85
PID 3820 set thread context of 5052	3820	vbc.exe	86
PID 3820 set thread context of 3076	3820	vbc.exe	88

UPX packed file 10 IoCs

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

upx

resource	yara_rule
behavioral2/memory/5052-9-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/5052-12-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/5052-13-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/5052-14-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/5052-18-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/3076-20-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3076-24-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3076-23-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3076-26-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/3076-29-0x0000000000400000-0x000000000041F000-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	vbc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	35a17271da1a5f66444b085d959e0c9b_JaffaCakes118.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
3820	vbc.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 3592 wrote to memory of 3820	3592	35a17271da1a5f66444b085d959e0c9b_JaffaCakes118.exe	85
PID 3592 wrote to memory of 3820	3592	35a17271da1a5f66444b085d959e0c9b_JaffaCakes118.exe	85
PID 3592 wrote to memory of 3820	3592	35a17271da1a5f66444b085d959e0c9b_JaffaCakes118.exe	85
PID 3592 wrote to memory of 3820	3592	35a17271da1a5f66444b085d959e0c9b_JaffaCakes118.exe	85
PID 3592 wrote to memory of 3820	3592	35a17271da1a5f66444b085d959e0c9b_JaffaCakes118.exe	85
PID 3592 wrote to memory of 3820	3592	35a17271da1a5f66444b085d959e0c9b_JaffaCakes118.exe	85
PID 3592 wrote to memory of 3820	3592	35a17271da1a5f66444b085d959e0c9b_JaffaCakes118.exe	85
PID 3592 wrote to memory of 3820	3592	35a17271da1a5f66444b085d959e0c9b_JaffaCakes118.exe	85
PID 3820 wrote to memory of 5052	3820	vbc.exe	86
PID 3820 wrote to memory of 5052	3820	vbc.exe	86
PID 3820 wrote to memory of 5052	3820	vbc.exe	86
PID 3820 wrote to memory of 5052	3820	vbc.exe	86
PID 3820 wrote to memory of 5052	3820	vbc.exe	86
PID 3820 wrote to memory of 5052	3820	vbc.exe	86
PID 3820 wrote to memory of 5052	3820	vbc.exe	86
PID 3820 wrote to memory of 5052	3820	vbc.exe	86
PID 3820 wrote to memory of 3076	3820	vbc.exe	88
PID 3820 wrote to memory of 3076	3820	vbc.exe	88
PID 3820 wrote to memory of 3076	3820	vbc.exe	88
PID 3820 wrote to memory of 3076	3820	vbc.exe	88
PID 3820 wrote to memory of 3076	3820	vbc.exe	88
PID 3820 wrote to memory of 3076	3820	vbc.exe	88
PID 3820 wrote to memory of 3076	3820	vbc.exe	88
PID 3820 wrote to memory of 3076	3820	vbc.exe	88

C:\Users\Admin\AppData\Local\Temp\35a17271da1a5f66444b085d959e0c9b_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\35a17271da1a5f66444b085d959e0c9b_JaffaCakes118.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3592
- 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:3820
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\ZiIugNSCle.ini"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:5052
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\xDRj9QhSaT.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:3076

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

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Downloads

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

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/3076-29-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3076-27-0x0000000000420000-0x00000000004E9000-memory.dmp

Filesize
804KB

Download
memory/3076-26-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3076-23-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3076-24-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3076-20-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3592-11-0x0000000074D20000-0x00000000752D1000-memory.dmp

Filesize
5.7MB

Download
memory/3592-0-0x0000000074D22000-0x0000000074D23000-memory.dmp

Filesize
4KB

Download
memory/3592-2-0x0000000074D20000-0x00000000752D1000-memory.dmp

Filesize
5.7MB

Download
memory/3592-1-0x0000000074D20000-0x00000000752D1000-memory.dmp

Filesize
5.7MB

Download
memory/3820-6-0x0000000000400000-0x00000000004AB000-memory.dmp

Filesize
684KB

Download
memory/3820-3-0x0000000000400000-0x00000000004AB000-memory.dmp

Filesize
684KB

Download
memory/3820-25-0x0000000000400000-0x00000000004AB000-memory.dmp

Filesize
684KB

Download
memory/3820-31-0x0000000000400000-0x00000000004AB000-memory.dmp

Filesize
684KB

Download
memory/5052-13-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5052-14-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5052-18-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5052-12-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/5052-9-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download

Analysis

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