isrstealer | 1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a

Analysis

max time kernel
43s
max time network
47s
platform
windows7_x64
resource
win7-20220901-en
resource tags

arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system
submitted
21-10-2022 08:17

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General

Target

1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe
Size

474KB
MD5

591d4b220d8e425034be1aa8d66e5230
SHA1

12d004a920d037314444e946e3fed0d9f7f80f01
SHA256

1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a
SHA512

1335a34753ddfc03cc7dee80e336668f9f7ffe53c6336f1b43e7b45c48966847ba625297b981cb8731f8600f265f1921102b4be6dec3e3dbd27e0071f368bc16
SSDEEP

12288:mfx/RiZaBvxLEdUumMRVtbnW9CO8m/wre:mfhMQ54dtmMRVtbWz/7

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 10 IoCs

resource	yara_rule
behavioral1/memory/1720-63-0x0000000000400000-0x0000000000449000-memory.dmp	family_isrstealer
behavioral1/memory/1720-64-0x0000000000401110-mapping.dmp	family_isrstealer
behavioral1/memory/1720-67-0x0000000000400000-0x0000000000449000-memory.dmp	family_isrstealer
behavioral1/memory/584-71-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/584-73-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/584-74-0x0000000000401180-mapping.dmp	family_isrstealer
behavioral1/memory/1720-85-0x0000000000400000-0x0000000000449000-memory.dmp	family_isrstealer
behavioral1/memory/584-90-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/584-101-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/584-102-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/1272-99-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/1272-100-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral1/memory/1272-99-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/1272-100-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1784-79-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1784-83-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1784-87-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1784-89-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1784-91-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1272-94-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1272-98-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1272-99-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1272-100-0x0000000000400000-0x000000000041F000-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-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Windows\CurrentVersion\Run\iskype = "C:\\Users\\Admin\\AppData\\Local\\Temp\\file.exe"	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 1672 set thread context of 1720	1672	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	27
PID 1720 set thread context of 584	1720	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	28
PID 584 set thread context of 1784	584	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	29
PID 584 set thread context of 1272	584	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	33

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Opens file in notepad (likely ransom note) 1 IoCs

ransomware

pid	Process
1816	NOTEPAD.EXE

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
584	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe

Suspicious use of WriteProcessMemory 41 IoCs

description	pid	Process	procid_target
PID 1672 wrote to memory of 1720	1672	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	27
PID 1672 wrote to memory of 1720	1672	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	27
PID 1672 wrote to memory of 1720	1672	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	27
PID 1672 wrote to memory of 1720	1672	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	27
PID 1672 wrote to memory of 1720	1672	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	27
PID 1672 wrote to memory of 1720	1672	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	27
PID 1672 wrote to memory of 1720	1672	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	27
PID 1672 wrote to memory of 1720	1672	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	27
PID 1672 wrote to memory of 1720	1672	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	27
PID 1672 wrote to memory of 1720	1672	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	27
PID 1672 wrote to memory of 1720	1672	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	27
PID 1720 wrote to memory of 584	1720	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	28
PID 1720 wrote to memory of 584	1720	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	28
PID 1720 wrote to memory of 584	1720	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	28
PID 1720 wrote to memory of 584	1720	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	28
PID 1720 wrote to memory of 584	1720	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	28
PID 1720 wrote to memory of 584	1720	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	28
PID 1720 wrote to memory of 584	1720	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	28
PID 1720 wrote to memory of 584	1720	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	28
PID 584 wrote to memory of 1784	584	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	29
PID 584 wrote to memory of 1784	584	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	29
PID 584 wrote to memory of 1784	584	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	29
PID 584 wrote to memory of 1784	584	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	29
PID 584 wrote to memory of 1784	584	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	29
PID 584 wrote to memory of 1784	584	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	29
PID 584 wrote to memory of 1784	584	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	29
PID 584 wrote to memory of 1784	584	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	29
PID 584 wrote to memory of 1784	584	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	29
PID 1720 wrote to memory of 1816	1720	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	30
PID 1720 wrote to memory of 1816	1720	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	30
PID 1720 wrote to memory of 1816	1720	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	30
PID 1720 wrote to memory of 1816	1720	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	30
PID 584 wrote to memory of 1272	584	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	33
PID 584 wrote to memory of 1272	584	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	33
PID 584 wrote to memory of 1272	584	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	33
PID 584 wrote to memory of 1272	584	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	33
PID 584 wrote to memory of 1272	584	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	33
PID 584 wrote to memory of 1272	584	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	33
PID 584 wrote to memory of 1272	584	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	33
PID 584 wrote to memory of 1272	584	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	33
PID 584 wrote to memory of 1272	584	1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe	33

C:\Users\Admin\AppData\Local\Temp\1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe
"C:\Users\Admin\AppData\Local\Temp\1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1672
- C:\Users\Admin\AppData\Local\Temp\1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe
  "C:\Users\Admin\AppData\Local\Temp\1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious use of SetThreadContext
  - Suspicious use of WriteProcessMemory
  PID:1720
- - C:\Users\Admin\AppData\Local\Temp\1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe
    "C:\Users\Admin\AppData\Local\Temp\1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe"
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:584
  - - C:\Users\Admin\AppData\Local\Temp\1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\D9osGGsiu6.ini"
      4⤵
      PID:1784
  - - C:\Users\Admin\AppData\Local\Temp\1415af94f7a9b7bdb07bb9c113b025b0b6f6cff5f072baa3735363f16897be4a.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\QUZN44VrzR.ini"
      4⤵
      Accesses Microsoft Outlook accounts
      PID:1272
- - C:\Windows\SysWOW64\NOTEPAD.EXE
    "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Local\Temp\readme.txt
    3⤵
    - Opens file in notepad (likely ransom note)
    PID:1816

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Credentials in Files

T1081

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\D9osGGsiu6.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
C:\Users\Admin\AppData\Local\Temp\readme.txt

Filesize
199B

MD5
d9a2f37d46e6c2711d7c8a30050fea6f

SHA1
d19221df6f2e2a7e602d17654fcfe8b555c29b98

SHA256
d882d8049a6ffe9467539ffb5a3531aa5f780be1afe07240089dd733e1a814db

SHA512
3e19a45e7357c3c2f7709f0008c656dadcd9cc1f77ce9d47b4bed5ca91305d6ff06fc2cf1148a37ccb9b6cadce474967a4674acb41d58d510eba3d6ba8c13a8e

Download Submit
memory/584-69-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/584-90-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/584-101-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/584-102-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/584-73-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/584-68-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/584-71-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1272-100-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1272-94-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1272-98-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1272-99-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1720-60-0x0000000000400000-0x0000000000449000-memory.dmp

Filesize
292KB

Download
memory/1720-55-0x0000000000400000-0x0000000000449000-memory.dmp

Filesize
292KB

Download
memory/1720-66-0x0000000075111000-0x0000000075113000-memory.dmp

Filesize
8KB

Download
memory/1720-61-0x0000000000400000-0x0000000000449000-memory.dmp

Filesize
292KB

Download
memory/1720-63-0x0000000000400000-0x0000000000449000-memory.dmp

Filesize
292KB

Download
memory/1720-85-0x0000000000400000-0x0000000000449000-memory.dmp

Filesize
292KB

Download
memory/1720-59-0x0000000000400000-0x0000000000449000-memory.dmp

Filesize
292KB

Download
memory/1720-58-0x0000000000400000-0x0000000000449000-memory.dmp

Filesize
292KB

Download
memory/1720-67-0x0000000000400000-0x0000000000449000-memory.dmp

Filesize
292KB

Download
memory/1720-56-0x0000000000400000-0x0000000000449000-memory.dmp

Filesize
292KB

Download
memory/1784-91-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1784-89-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1784-87-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1784-83-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1784-79-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download