isrstealer | 1a44a0bc93d4f829404adb03337d66684593f764c8cc959f2a0c80d6cd56bbba

General

Target

1a44a0bc93d4f829404adb03337d66684593f764c8cc959f2a0c80d6cd56bbba.exe
Size

452KB
MD5

6310da29e3c9d8606ce05e96ae4fbcff
SHA1

a75c9e7c7b3fa2988c960260f01ab746ea3ba228
SHA256

1a44a0bc93d4f829404adb03337d66684593f764c8cc959f2a0c80d6cd56bbba
SHA512

aa8ad9036e165afec6b91c2757c2af60c9e0937cf08231d537b344d2d0804cb5b396858d0b2eadf3ccaf914ce23ae371ed8859dc6f176fe15d5c40a9322b798f
SSDEEP

6144:jSrawA/kU4eYKLBa0eqWeOUb2qdjYbMIOL1B41uAXROPoBJOpOnnnnnnnnnnnnnC:jSrLA/9jeqaUb2quMIOL741uHQBQ

Score

10^/10

isrstealer collection 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 6 IoCs

resource	yara_rule
behavioral1/memory/1864-61-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1864-63-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1864-64-0x0000000000401180-mapping.dmp	family_isrstealer
behavioral1/memory/1864-77-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1864-87-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1864-88-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/1756-83-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/1756-84-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/1756-85-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 3 IoCs

resource	yara_rule
behavioral1/memory/1756-83-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/1756-84-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/1756-85-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 11 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1668-70-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1668-74-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1668-75-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1668-76-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1756-78-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1756-82-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1756-83-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1756-84-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1756-85-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1668-86-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1668-89-0x0000000000400000-0x0000000000453000-memory.dmp	upx

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3406023954-474543476-3319432036-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	vbc.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 956 set thread context of 1864	956	1a44a0bc93d4f829404adb03337d66684593f764c8cc959f2a0c80d6cd56bbba.exe	28
PID 1864 set thread context of 1668	1864	vbc.exe	29
PID 1864 set thread context of 1756	1864	vbc.exe	30

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	956	1a44a0bc93d4f829404adb03337d66684593f764c8cc959f2a0c80d6cd56bbba.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1864	vbc.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 956 wrote to memory of 1864	956	1a44a0bc93d4f829404adb03337d66684593f764c8cc959f2a0c80d6cd56bbba.exe	28
PID 956 wrote to memory of 1864	956	1a44a0bc93d4f829404adb03337d66684593f764c8cc959f2a0c80d6cd56bbba.exe	28
PID 956 wrote to memory of 1864	956	1a44a0bc93d4f829404adb03337d66684593f764c8cc959f2a0c80d6cd56bbba.exe	28
PID 956 wrote to memory of 1864	956	1a44a0bc93d4f829404adb03337d66684593f764c8cc959f2a0c80d6cd56bbba.exe	28
PID 956 wrote to memory of 1864	956	1a44a0bc93d4f829404adb03337d66684593f764c8cc959f2a0c80d6cd56bbba.exe	28
PID 956 wrote to memory of 1864	956	1a44a0bc93d4f829404adb03337d66684593f764c8cc959f2a0c80d6cd56bbba.exe	28
PID 956 wrote to memory of 1864	956	1a44a0bc93d4f829404adb03337d66684593f764c8cc959f2a0c80d6cd56bbba.exe	28
PID 956 wrote to memory of 1864	956	1a44a0bc93d4f829404adb03337d66684593f764c8cc959f2a0c80d6cd56bbba.exe	28
PID 1864 wrote to memory of 1668	1864	vbc.exe	29
PID 1864 wrote to memory of 1668	1864	vbc.exe	29
PID 1864 wrote to memory of 1668	1864	vbc.exe	29
PID 1864 wrote to memory of 1668	1864	vbc.exe	29
PID 1864 wrote to memory of 1668	1864	vbc.exe	29
PID 1864 wrote to memory of 1668	1864	vbc.exe	29
PID 1864 wrote to memory of 1668	1864	vbc.exe	29
PID 1864 wrote to memory of 1668	1864	vbc.exe	29
PID 1864 wrote to memory of 1668	1864	vbc.exe	29
PID 1864 wrote to memory of 1756	1864	vbc.exe	30
PID 1864 wrote to memory of 1756	1864	vbc.exe	30
PID 1864 wrote to memory of 1756	1864	vbc.exe	30
PID 1864 wrote to memory of 1756	1864	vbc.exe	30
PID 1864 wrote to memory of 1756	1864	vbc.exe	30
PID 1864 wrote to memory of 1756	1864	vbc.exe	30
PID 1864 wrote to memory of 1756	1864	vbc.exe	30
PID 1864 wrote to memory of 1756	1864	vbc.exe	30
PID 1864 wrote to memory of 1756	1864	vbc.exe	30

C:\Users\Admin\AppData\Local\Temp\1a44a0bc93d4f829404adb03337d66684593f764c8cc959f2a0c80d6cd56bbba.exe
"C:\Users\Admin\AppData\Local\Temp\1a44a0bc93d4f829404adb03337d66684593f764c8cc959f2a0c80d6cd56bbba.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:956
- 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
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1864
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\9ScHUBLd8U.ini"
    3⤵
    PID:1668
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\iMhtrhZnkQ.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:1756

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scripting

1

T1064

Persistence

Privilege Escalation

Defense Evasion

Scripting

1

T1064

Credential Access

Discovery

Lateral Movement

Collection

Email Collection

1

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

memory/956-54-0x0000000075FE1000-0x0000000075FE3000-memory.dmp

Filesize
8KB

Download
memory/956-55-0x0000000074610000-0x0000000074BBB000-memory.dmp

Filesize
5.7MB

Download
memory/956-56-0x0000000074610000-0x0000000074BBB000-memory.dmp

Filesize
5.7MB

Download
memory/956-57-0x0000000000696000-0x00000000006A7000-memory.dmp

Filesize
68KB

Download
memory/956-67-0x0000000074610000-0x0000000074BBB000-memory.dmp

Filesize
5.7MB

Download
memory/956-68-0x0000000000696000-0x00000000006A7000-memory.dmp

Filesize
68KB

Download
memory/1668-89-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1668-86-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1668-74-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1668-76-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1668-75-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1668-70-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1756-83-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1756-85-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1756-84-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1756-78-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1756-82-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1864-61-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1864-63-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1864-77-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1864-59-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1864-87-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1864-88-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1864-58-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download

Analysis

Sharing