isrstealer | 9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be

General

Target

9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe
Size

357KB
MD5

87745db6b706ee4ac5900838c661e1d3
SHA1

c6dd4ce078b86f216dc50c6107b116fea55dcf48
SHA256

9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be
SHA512

0ae59abeb0be99519dcfbddce89f19e367dd80c84259fb0548e88d2ee3380d9cbcaf29448555936fb487d2d30e84382dc334b7aba40ac72c289469e45cbf7289
SSDEEP

6144:qowYxgI2hA+Uk2CNxcenTLt1ukosGo4M52QJTbGVzxNX3d1vpTMK3fmlj0+B2Vfe:qowYxL2urqxNvDdl5JQxNXnxTjx+B2Vf

Score

10^/10

isrstealer collection 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/3988-133-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3988-135-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/3988-137-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/980-151-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/980-152-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/980-153-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 3 IoCs

resource	yara_rule
behavioral2/memory/980-151-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/980-152-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/980-153-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral2/memory/792-141-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/792-143-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/792-144-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/792-145-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/980-148-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/980-150-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/980-151-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/980-152-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/980-153-0x0000000000400000-0x000000000041F000-memory.dmp	upx

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
T1081

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 740 set thread context of 3988	740	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	80
PID 3988 set thread context of 792	3988	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	81
PID 3988 set thread context of 980	3988	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	82

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3988	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 740 wrote to memory of 3988	740	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	80
PID 740 wrote to memory of 3988	740	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	80
PID 740 wrote to memory of 3988	740	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	80
PID 740 wrote to memory of 3988	740	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	80
PID 740 wrote to memory of 3988	740	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	80
PID 740 wrote to memory of 3988	740	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	80
PID 740 wrote to memory of 3988	740	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	80
PID 740 wrote to memory of 3988	740	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	80
PID 3988 wrote to memory of 792	3988	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	81
PID 3988 wrote to memory of 792	3988	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	81
PID 3988 wrote to memory of 792	3988	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	81
PID 3988 wrote to memory of 792	3988	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	81
PID 3988 wrote to memory of 792	3988	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	81
PID 3988 wrote to memory of 792	3988	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	81
PID 3988 wrote to memory of 792	3988	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	81
PID 3988 wrote to memory of 792	3988	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	81
PID 3988 wrote to memory of 980	3988	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	82
PID 3988 wrote to memory of 980	3988	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	82
PID 3988 wrote to memory of 980	3988	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	82
PID 3988 wrote to memory of 980	3988	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	82
PID 3988 wrote to memory of 980	3988	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	82
PID 3988 wrote to memory of 980	3988	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	82
PID 3988 wrote to memory of 980	3988	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	82
PID 3988 wrote to memory of 980	3988	9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe	82

C:\Users\Admin\AppData\Local\Temp\9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe
"C:\Users\Admin\AppData\Local\Temp\9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:740
- C:\Users\Admin\AppData\Local\Temp\9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe
  C:\Users\Admin\AppData\Local\Temp\9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3988
- - C:\Users\Admin\AppData\Local\Temp\9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\7NR9xbfyBA.ini"
    3⤵
    PID:792
- - C:\Users\Admin\AppData\Local\Temp\9b933a1465ef307beccd52d53b5f087862a32997199d2f475a0856baea1470be.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\K9T3vsxqt7.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:980

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\7NR9xbfyBA.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/792-145-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/792-143-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/792-144-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/792-141-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/980-148-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/980-150-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/980-151-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/980-152-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/980-153-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3988-135-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3988-133-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/3988-137-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download

Analysis

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