isrstealer | e8cd0ef98abb8b7f8c3a7c05c7e1748963d0e4c23ef29d0dc350ed1373833a7c

General

Target

f76d8260aeef01c0040deb7e4987aced_JaffaCakes118.exe
Size

1.3MB
MD5

f76d8260aeef01c0040deb7e4987aced
SHA1

52794a6360e479738a7c418a3e8275378239ef33
SHA256

e8cd0ef98abb8b7f8c3a7c05c7e1748963d0e4c23ef29d0dc350ed1373833a7c
SHA512

0f4bccb9fa5457255847dd1c6fbccc64cb82a057fd2daf47f7fdb83b6363d82b81b0bed75830bb4a15ee7ec9342dbce5628d5867d9b827b18879d6fad978c426
SSDEEP

24576:TNR2zaQBt37/CZ0w1PeWnzqhqCC6+PEDdZp/K/LsOBQ8tcp/:yUsrC6aEpZpbZ

Score

10^/10

isrstealer collection 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
behavioral2/memory/1416-0-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1416-2-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/1416-21-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/2284-20-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/2284-19-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral2/memory/2284-20-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/2284-19-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

Reads user/profile data of web browsers 2 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

UPX packed file 10 IoCs

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

upx

resource	yara_rule
behavioral2/memory/876-5-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/876-7-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/876-9-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/876-11-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/876-10-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2284-14-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/2284-16-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/2284-18-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/2284-20-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/2284-19-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4084619521-2220719027-1909462854-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	RegAsm.exe

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-1-5-21-4084619521-2220719027-1909462854-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\I7ak1YeiVt_4Udke = "C:\\Users\\Admin\\AppData\\Local\\Temp\\f76d8260aeef01c0040deb7e4987aced_JaffaCakes118.exe"	f76d8260aeef01c0040deb7e4987aced_JaffaCakes118.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2168 set thread context of 1416	2168	f76d8260aeef01c0040deb7e4987aced_JaffaCakes118.exe	92
PID 1416 set thread context of 876	1416	RegAsm.exe	93
PID 1416 set thread context of 2284	1416	RegAsm.exe	94

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1416	RegAsm.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 2168 wrote to memory of 1416	2168	f76d8260aeef01c0040deb7e4987aced_JaffaCakes118.exe	92
PID 2168 wrote to memory of 1416	2168	f76d8260aeef01c0040deb7e4987aced_JaffaCakes118.exe	92
PID 2168 wrote to memory of 1416	2168	f76d8260aeef01c0040deb7e4987aced_JaffaCakes118.exe	92
PID 2168 wrote to memory of 1416	2168	f76d8260aeef01c0040deb7e4987aced_JaffaCakes118.exe	92
PID 2168 wrote to memory of 1416	2168	f76d8260aeef01c0040deb7e4987aced_JaffaCakes118.exe	92
PID 2168 wrote to memory of 1416	2168	f76d8260aeef01c0040deb7e4987aced_JaffaCakes118.exe	92
PID 2168 wrote to memory of 1416	2168	f76d8260aeef01c0040deb7e4987aced_JaffaCakes118.exe	92
PID 2168 wrote to memory of 1416	2168	f76d8260aeef01c0040deb7e4987aced_JaffaCakes118.exe	92
PID 1416 wrote to memory of 876	1416	RegAsm.exe	93
PID 1416 wrote to memory of 876	1416	RegAsm.exe	93
PID 1416 wrote to memory of 876	1416	RegAsm.exe	93
PID 1416 wrote to memory of 876	1416	RegAsm.exe	93
PID 1416 wrote to memory of 876	1416	RegAsm.exe	93
PID 1416 wrote to memory of 876	1416	RegAsm.exe	93
PID 1416 wrote to memory of 876	1416	RegAsm.exe	93
PID 1416 wrote to memory of 876	1416	RegAsm.exe	93
PID 1416 wrote to memory of 2284	1416	RegAsm.exe	94
PID 1416 wrote to memory of 2284	1416	RegAsm.exe	94
PID 1416 wrote to memory of 2284	1416	RegAsm.exe	94
PID 1416 wrote to memory of 2284	1416	RegAsm.exe	94
PID 1416 wrote to memory of 2284	1416	RegAsm.exe	94
PID 1416 wrote to memory of 2284	1416	RegAsm.exe	94
PID 1416 wrote to memory of 2284	1416	RegAsm.exe	94
PID 1416 wrote to memory of 2284	1416	RegAsm.exe	94

C:\Users\Admin\AppData\Local\Temp\f76d8260aeef01c0040deb7e4987aced_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\f76d8260aeef01c0040deb7e4987aced_JaffaCakes118.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2168
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1416
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\47ICxFp7rk.ini"
    3⤵
    PID:876
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\u9DY80IbPK.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:2284

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

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\47ICxFp7rk.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/876-10-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/876-5-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/876-7-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/876-9-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/876-11-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1416-0-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1416-2-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1416-21-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2284-14-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2284-16-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2284-18-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2284-20-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2284-19-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads