isrstealer | ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618

General

Target

ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618.exe
Size

350KB
MD5

6cd01c6c456e2831ecdafb575d783c4d
SHA1

4164244dcda6811f4ad239ab139f00b11381a031
SHA256

ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618
SHA512

4c9e50090121f60d1fd4e19c2910a0d3c6c59364b642345e76f53fd2250316e1c6fedc3898715c97123e02c46f64689556665c775385c2cdc10f9ab6c0a82039
SSDEEP

6144:jwUSAb47OeNfJxOUwGjDkTk5y0H/1xqjlkKQb1UYcDtZsbR7f1PiIfPd:jpbx2zjDkAYM/1olkZKYchCbN8Wd

Score

10^/10

isrstealer collection persistence 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 5 IoCs

resource	yara_rule
behavioral1/memory/948-61-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/948-63-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/948-64-0x0000000000401180-mapping.dmp	family_isrstealer
behavioral1/memory/948-68-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/948-85-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/568-83-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/568-84-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral1/memory/568-83-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/568-84-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1204-69-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1204-73-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1204-74-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1204-75-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1204-76-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/568-78-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/568-82-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/568-83-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/568-84-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	cvtres.exe

Adds Run key to start application 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\Run\C:\Users\Admin\AppData\Local	ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618.exe
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\Run\C:\Users\Admin\AppData\Local\Temp	ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\Run\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618.exe"	ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618.exe
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\Run\C:\Users\Admin\AppData\Local\Temp\ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618.exe	ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618.exe
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\Run\C:	ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618.exe
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\Run\C:\Users	ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618.exe
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\Run\C:\Users\Admin	ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618.exe
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\Run\C:\Users\Admin\AppData	ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1184 set thread context of 948	1184	ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618.exe	26
PID 948 set thread context of 1204	948	cvtres.exe	27
PID 948 set thread context of 568	948	cvtres.exe	28

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1184	ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
948	cvtres.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 1184 wrote to memory of 948	1184	ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618.exe	26
PID 1184 wrote to memory of 948	1184	ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618.exe	26
PID 1184 wrote to memory of 948	1184	ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618.exe	26
PID 1184 wrote to memory of 948	1184	ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618.exe	26
PID 1184 wrote to memory of 948	1184	ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618.exe	26
PID 1184 wrote to memory of 948	1184	ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618.exe	26
PID 1184 wrote to memory of 948	1184	ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618.exe	26
PID 1184 wrote to memory of 948	1184	ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618.exe	26
PID 948 wrote to memory of 1204	948	cvtres.exe	27
PID 948 wrote to memory of 1204	948	cvtres.exe	27
PID 948 wrote to memory of 1204	948	cvtres.exe	27
PID 948 wrote to memory of 1204	948	cvtres.exe	27
PID 948 wrote to memory of 1204	948	cvtres.exe	27
PID 948 wrote to memory of 1204	948	cvtres.exe	27
PID 948 wrote to memory of 1204	948	cvtres.exe	27
PID 948 wrote to memory of 1204	948	cvtres.exe	27
PID 948 wrote to memory of 1204	948	cvtres.exe	27
PID 948 wrote to memory of 568	948	cvtres.exe	28
PID 948 wrote to memory of 568	948	cvtres.exe	28
PID 948 wrote to memory of 568	948	cvtres.exe	28
PID 948 wrote to memory of 568	948	cvtres.exe	28
PID 948 wrote to memory of 568	948	cvtres.exe	28
PID 948 wrote to memory of 568	948	cvtres.exe	28
PID 948 wrote to memory of 568	948	cvtres.exe	28
PID 948 wrote to memory of 568	948	cvtres.exe	28
PID 948 wrote to memory of 568	948	cvtres.exe	28

C:\Users\Admin\AppData\Local\Temp\ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618.exe
"C:\Users\Admin\AppData\Local\Temp\ea00bfb017bd00a331d033863bc4f81c626ba96668beaea703172aa4edefa618.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1184
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\cvtres.exe
  C:\Windows\Microsoft.NET\Framework\v2.0.50727\cvtres.exe
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:948
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\cvtres.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\hs6hk20z2t.ini"
    3⤵
    PID:1204
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\cvtres.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\lLK6rqjRTO.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:568

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

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\hs6hk20z2t.ini

Filesize
5B

MD5
d1ea279fb5559c020a1b4137dc4de237

SHA1
db6f8988af46b56216a6f0daf95ab8c9bdb57400

SHA256
fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba

SHA512
720e9c284f0559015312df7fe977563e5e16f48d3506e51eb4016adf7971924d352f740b030aa3adc81b6f65fd1dba12df06d10fa6c115074e5097e7ee0f08b3

Download Submit
memory/568-84-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/568-83-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/568-82-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/568-78-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/948-61-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/948-58-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/948-68-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/948-63-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/948-85-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/948-59-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1184-86-0x0000000001F16000-0x0000000001F27000-memory.dmp

Filesize
68KB

Download
memory/1184-55-0x0000000074300000-0x00000000748AB000-memory.dmp

Filesize
5.7MB

Download
memory/1184-56-0x0000000074300000-0x00000000748AB000-memory.dmp

Filesize
5.7MB

Download
memory/1184-57-0x0000000001F16000-0x0000000001F27000-memory.dmp

Filesize
68KB

Download
memory/1184-54-0x0000000074BB1000-0x0000000074BB3000-memory.dmp

Filesize
8KB

Download
memory/1204-76-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1204-75-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1204-74-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1204-73-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1204-69-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download

Analysis

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